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71 topics, 280 quizzes — free, no sign-in needed to browse.

• Accrual Basis Accounting — business-finance · intermediate
  Learn what accrual basis accounting is, how it records revenue when earned and expenses when incurred, and when a growing business needs it.
• AI Leaders Testify Before NYC Council — Use Cases · beginner
  Sworn testimony and proposed kill-switch laws put AI accountability in the spotlight.
• ARR (Annual Recurring Revenue) — business-finance · intermediate
  Learn what annual recurring revenue is, why only repeating revenue counts, and how retainers build predictable income.
• Burn Multiple — business-finance · advanced
  Learn what burn multiple measures, how to figure it in plain language, and how to use it to keep your growth spending honest.
• CAC (Customer Acquisition Cost) — business-finance · beginner
  Learn what it costs to win a customer, how to calculate it, and how to keep it below what each customer is worth.
• CAC Payback — business-finance · intermediate
  Learn what CAC payback means, how it is figured in plain words, and why it matters for anyone spending money to win customers.
• Cash Basis Accounting — business-finance · beginner
  Learn what cash basis accounting is, how it records money only when it moves, and why it fits many small businesses.
• Cash Conversion Cycle — business-finance · advanced
  Learn what the cash conversion cycle is, how its three parts combine, and why a shorter cycle keeps a business's cash flowing.
• Churn — business-finance · beginner
  Learn what churn means, how to calculate customer churn in plain terms, and why keeping customers matters as much as finding new ones.
• Contribution Margin — business-finance · intermediate
  Learn what contribution margin is, how to calculate it from revenue and variable costs, and how it helps you price services so every sale actually moves you forward.
• Deferred Revenue Float — business-finance · advanced
  Learn what deferred revenue is, how the float works, and how to use upfront payments wisely in your own business.
• DPO (Days Payable Outstanding) — business-finance · intermediate
  Learn what DPO means, how it is figured in plain words, and how smart payment timing keeps more cash in your hands.
• DSO (Days Sales Outstanding) — business-finance · intermediate
  Learn what DSO means, how it is figured in plain words, and why collecting payments faster keeps your business healthy.
• Google's Gemini 4 Argon — Use Cases · beginner
  Google's first flagship model in nearly a year bets big on cybersecurity and long-horizon reasoning.
• Gross Margin — business-finance · intermediate
  Learn what gross margin reveals about each sale, how to calculate it, and how AI automation can lift it.
• LTV (Lifetime Value) — business-finance · beginner
  Learn what lifetime value means, how to estimate it in plain language, and why it shapes smart pricing and client decisions.
• Making Money with AI — Use Cases · beginner
  A hype-free map of every realistic way to earn with AI: freelancing, digital products, local business services, content, micro-apps, and how to pick one lane.
• Negative Working Capital — business-finance · advanced
  Learn what negative working capital means, when it signals strength versus danger, and how it shows up in a freelancer's finances.
• Net Dollar Retention — business-finance · advanced
  Learn what net dollar retention measures, how expansion revenue offsets churn, and why businesses with retention above 100 percent can grow without new customers.
• OpenAI Shelves GPT-6.1 Astra — Use Cases · beginner
  Why OpenAI cancelled a flagship model release over safety concerns — and what it means for responsible AI development.
• Perplexity's Open Embedding Model — Use Cases · beginner
  How 'late chunking' keeps document context intact — and why retrieval matters.
• Prompt Engineering for Income Generation — Use Cases · intermediate
  Learn how better prompts produce better sellable output: core techniques, iteration, reusable templates, and selling prompt packs.
• Selling Online with AI — Use Cases · beginner
  A beginner's guide to running an online store with AI doing the heavy lifting: picking products, listings that convert, pricing, setup, customers, and honest expectations.
• The Super Intelligence Force — Use Cases · beginner
  A new federal AI group gets 120 days to assess risks — without pausing development.
• Vibe Coding — AI Apps · intermediate
  Learn what vibe coding is, which tools make it possible, how to prompt AI to write working software, and how to turn builds into income.
• Working Capital — business-finance · beginner
  Learn what working capital is, how to figure it out in plain language, and why keeping it healthy matters for any business.
• Prompt Engineering — Use Cases · beginner
  AI Literacy Topic 1, Track 1: learn to steer AI with clear, well-structured prompts. 24 quizzes, 7 questions each — every question includes a short article and a workplace scenario to read first.
• Critical Evaluation — Use Cases · beginner
  AI Literacy Topic 1, Track 2: learn to verify AI output before you trust it — spotting hallucinations, bias, and confident-but-wrong answers. 24 quizzes, 7 questions each — every question includes a short article and a workplace scenario to read first.
• Adversarial Attacks on AI — AI Terms · advanced
  Learn how attackers craft inputs that fool AI models, from invisible image perturbations to prompt injection, and how defenders fight back.
• AI and the Future of Work — Use Cases · advanced
  Understand how AI is reshaping work: automation versus augmentation, which tasks are most exposed, what the early evidence shows, and the practical playbook for thriving alongside AI.
• AI Bias and Fairness — AI Terms · advanced
  Learn where AI bias comes from, how fairness is measured with metrics like demographic parity and equalized odds, and how teams audit and mitigate it.
• AI Copyright and Ownership — Use Cases · advanced
  Learn who owns AI-generated work, how training-data scraping is being challenged, what fair use means here, and how to manage the risks.
• AI for Data Analysis — Use Cases · intermediate
  Learn how to use AI as an analytical assistant: describing data well, asking sharp questions, spotting patterns, building charts, and verifying every number.
• AI for Job Hunting — Use Cases · intermediate
  Learn how to use AI to write stronger resumes and cover letters, prepare for interviews, research companies, and run an honest, effective job hunt.
• AI in Customer Service — Use Cases · beginner
  Discover how chatbots, AI assistants, and voice agents are changing customer support for businesses and shoppers alike.
• AI in Education — Use Cases · beginner
  Learner-built quiz on AI in Education, created with the Quiz Builder from the reviewed question bank and approved by an admin reviewer.
• AI in Healthcare — Use Cases · intermediate
  Explore how AI is used in medicine, from imaging and diagnostics to clinical notes, plus the privacy risks, biases, and human-oversight rules that keep patients safe.
• AI Safety and Alignment — AI Terms · advanced
  Why advanced AI systems can behave in ways their creators did not intend, and how alignment research — from RLHF to red-teaming to interpretability — tries to keep powerful models aligned with human values.
• Building AI Agents — Use Cases · advanced
  Learn how autonomous AI agents are designed and deployed: the architectures behind them, how they use tools and memory, how they plan, and how multiple agents coordinate as systems.
• Deploying AI Systems — Use Cases · advanced
  Learn how to serve AI models in production through APIs, navigate latency and cost tradeoffs, set up monitoring and observability, and implement guardrails that keep deployed systems safe and reliable.
• Fine-Tuning Explained — AI Terms · intermediate
  Fine-tuning retrains a pretrained AI model on a smaller, task-specific dataset so it behaves reliably for one job instead of everything. Learn how it differs from prompting, when it pays off, and how the process works.
• Introduction to AI — AI Terms · beginner
  Learner-built quiz on Introduction to AI, created with the Quiz Builder from the reviewed question bank and approved by an admin reviewer.
• Model Distillation Explained — AI Terms · advanced
  Learn how knowledge distillation compresses large teacher models into smaller, faster student models.
• Model Evaluation Metrics — AI Terms · advanced
  Learn how AI models are measured and compared: from accuracy, precision, recall, and F1 to BLEU and ROUGE for generated text, human evaluation protocols, and the major benchmarks used to rank frontier models.
• Multimodal AI — AI Apps · advanced
  Models that see, hear, and read: how vision-language systems combine modalities, where they are used today, and the open technical challenges they still face.
• Reinforcement Learning from Human Feedback — AI Terms · advanced
  Learn how RLHF aligns language models with human preferences using reward models and policy optimization.
• Retrieval-Augmented Generation (RAG) — AI Terms · advanced
  How RAG systems retrieve relevant documents from an embedding store and feed them to a language model, plus the chunking and index choices that decide whether retrieval helps or hurts.
• Test Your Knowledge: AI and Classical Architecture — Use Cases · beginner
  A short quiz on the Georgia Tech story about AI models for visualizing classical architecture.
• Test Your Knowledge: AI and Next-Generation Magnets — Use Cases · beginner
  A short quiz on the Rice University story about AI-accelerated magnet discovery.
• Test Your Knowledge: AI Cyber Challenge Lessons — Use Cases · beginner
  Quiz on Georgia Tech's analysis of DARPA's AI Cyber Challenge.
• Test Your Knowledge: AI Filter for CERN's Collider — Use Cases · beginner
  Quiz on the UChicago-led AI data filter for CERN's Large Hadron Collider.
• Test Your Knowledge: AI for Dementia Risk Detection — Use Cases · beginner
  Quiz on UMD's AI tool for identifying dementia risk in understudied populations.
• Test Your Knowledge: AI in Libraries — Use Cases · beginner
  A short quiz on the Purdue Libraries story about three grants for AI innovation.
• Test Your Knowledge: AI Mapping Math Misconceptions — Use Cases · beginner
  Quiz on WPI's NSF-funded project to use AI in understanding students' math errors.
• Test Your Knowledge: Cornell's AI Critical Thinking Grant — Use Cases · beginner
  Check what you learned about Cornell's NSF-funded project exploring whether AI can support students' critical thinking.
• Test Your Knowledge: Cornell's Orchard Robotics Project — Use Cases · beginner
  Check what you learned about Cornell's USDA-funded project bringing robots and AI to US orchards.
• Test Your Knowledge: Curtin's AI Fellowship Research — Use Cases · beginner
  Quiz on Curtin University's ARC Future Fellowships including AI in recruitment research.
• Test Your Knowledge: Generative Cameras — Use Cases · beginner
  Quiz on Rice University's NSF-funded generative cameras project.
• Test Your Knowledge: Human-Centered AI Surveillance — Use Cases · beginner
  A short quiz on the University of Iowa NSF grant for explainable video surveillance AI.
• Test Your Knowledge: Iowa's AI Discovery Initiative — Use Cases · beginner
  Quiz on the University of Iowa's $1M+ AI Discovery Initiative.
• Test Your Knowledge: Iowa's Campuswide AI Strategy — Use Cases · beginner
  Check what you learned about the University of Iowa's campuswide AI strategy and new AI certificate.
• Test Your Knowledge: MESA AI Research Platform — Use Cases · beginner
  Quiz on the NSF-funded MESA AI platform for speeding scientific discovery.
• Test Your Knowledge: NTNU's AI for Intestinal Disease Detection — Use Cases · beginner
  Check what you learned about NTNU's project using AI to help doctors detect intestinal disease.
• Test Your Knowledge: Robotic Chemistry and Explainable AI — Use Cases · beginner
  A short quiz on the Durham University story about robotic laboratories and explainable AI in chemistry.
• Test Your Knowledge: Southampton's EU AI Research Grants — Use Cases · beginner
  Quiz on University of Southampton's ERC grants including AI authoritarianism research.
• Test Your Knowledge: Stanford's AI Cell Biology Models — Use Cases · beginner
  Check what you learned about the Stanford Medicine AI models developed for cell biology.
• Test Your Knowledge: Sydney's ChatGPT Edu Rollout — Use Cases · beginner
  Quiz on the University of Sydney's campus-wide ChatGPT Edu access and $1M Sustainable AI Fund.
• The Future of AI — AI History · advanced
  An advanced look at the AGI debate, the trends reshaping artificial intelligence, AI's societal impact, and the concrete skills learners need to stay ahead.
• The Transformer Architecture — AI History · advanced
  How the self-attention mechanism replaced recurrence in neural networks and ignited the modern large-language-model era.
• Vector Databases Explained — AI Terms · advanced
  Learn how vector databases store embeddings, run similarity search, and power retrieval for AI applications.
• AI Video Generation — AI Apps · beginner
  Learn to create viral AI-generated videos: prompting, camera and grade, branding, audio, and publishing. 24 quizzes, 168 questions.