01
AI Foundations
Understand what AI is, how systems learn, where they fail, and how to judge claims without hype.
Free AI library
Language AI guidesFree forever.
155 plain-English guides, structured learning paths, and an open library — built by an independent 501(c)(3) nonprofit so anyone can understand modern AI.
155Free guides
1Topic tracks
~2 minPer guide
~5hReading time
Start here
Five outcome-based courses
Each course includes explicit outcomes, mapped competencies, practice activities, and an applied capstone.
02
Responsible AI User
Use AI productively while protecting privacy, checking outputs, and preserving human accountability.
03
AI at Work
Evaluate workplace use cases, run safe pilots, measure value, and communicate changes responsibly.
04
AI Policy & Society
Analyze AI systems through rights, equity, governance, safety, and public-interest outcomes.
05
Building with AI Systems
Understand language models, retrieval, agents, evaluation, cost, and deployment safeguards through practical system design.
Topic tracks
Browse by track
Jump into the area you care about. Every track has multiple plain-English guides.
FundamentalsCore concepts: how AI works at a high level.84 guides Language AILLMs, NLP, ChatGPT, prompting, and text understanding.155 guides Visual AIImage generation, computer vision, video, and design.133 guides Audio AIVoice, music, podcasting, and audio-first AI.117 guides CompaniesProfiles of OpenAI, Anthropic, Google, Meta, and more.121 guides ApplicationsHow AI shows up in coding, search, agents, and daily life.111 guides IndustriesAI in healthcare, finance, education, energy, and more.91 guides TechnicalChips, fine-tuning, RAG, vectors, and AI infrastructure.177 guides SocietyBias, privacy, copyright, safety, and the AI future.30 guides
Full library
All guides
155 of 1019 guides shown. Filter by track or search above.
Language AI
Conversational AI
Conversational AI is technology that lets people interact with computers through natural back-and-forth dialogue, by text or voice, instead of menus…
Language AICoreference Resolution
Coreference resolution is the task of figuring out when different words in a text refer to the same thing, such as linking "she" or "the CEO" back to "Maria.
Language AIText Embeddings
Text embeddings turn words, sentences, or documents into lists of numbers (vectors) that capture meaning, so that texts with similar meanings end up close…
Language AISliding Window Attention
Sliding window attention restricts each token to attend only to a fixed-size neighborhood of nearby tokens instead of the entire sequence.
Language AIByte-Pair Encoding
Byte-Pair Encoding (BPE) is a compression-inspired algorithm that builds a vocabulary by repeatedly merging the most frequent pair of symbols.
Language AISubword Tokenization
Subword tokenization splits text into units smaller than words but larger than characters, like 'token' plus 'ization'.
Language AIFlashAttention
FlashAttention is a memory-efficient algorithm that computes the exact same attention as standard transformers but without ever writing the giant attention…
Language AIGrouped-Query Attention
Grouped-Query Attention (GQA) is a way to shrink the memory needed during text generation by letting several query heads share the same key and value heads.
Language AIRotary Position Embeddings
Rotary Position Embeddings (RoPE) encode where each token sits in a sequence by rotating its query and key vectors by an angle proportional to position.
Language AIPrefix Tuning
Prefix tuning is a parameter-efficient way to adapt a frozen language model by training a small set of continuous vectors that get prepended to every layer's…
Language AIPrompt Tuning
Prompt tuning adapts a frozen language model by learning a handful of continuous 'soft prompt' vectors prepended to the input, rather than writing words…
Language AIRetrieval Reranking
Retrieval reranking is the second stage of modern search: after a fast retriever pulls a candidate set, a more powerful model re-scores those candidates so…
Finished reading? Prove it.
Check what you learned with topic quizzes, then explore our structured courses and current certification requirements. Core guides remain free to read.