Lilly Tech Systems
Master Technology,
One Skill at a Time
Your free learning platform for AI, Machine Learning, System Design, Interview Preparation, and Coding Challenges. Build real-world skills with hands-on tutorials.
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From AI and cloud to system design and coding challenges — everything you need to level up your tech career.
AI School
489+ courses covering Artificial Intelligence, Machine Learning, Claude, Copilot, Cloud Computing, Security, Data Science, Deep Learning, and more. The most comprehensive free AI curriculum on the web.
Explore AI School →AI Skills
47 practitioner skills across the AI engineering stack: prompting, RAG, fine-tuning, agents, production AI, evaluation, and safety. The exact skills working AI engineers reach for every day.
Explore AI Skills →AI Agents
50 agent topics covering frameworks (LangGraph, CrewAI, AutoGen, LlamaIndex, Pydantic AI, Claude SDK), architectures, capabilities (code exec, web browsing, computer use, voice, vision), domain agents, and production operations.
Explore AI Agents →AI Vector Databases
50 topics covering 18 vector DBs (Pinecone, Weaviate, Qdrant, Chroma, Milvus, pgvector, LanceDB, Vespa, Elastic, Redis, Mongo, OpenSearch, and more), every major index algorithm, embeddings, search patterns, and production operations.
Explore Vector DBs →AI Hardware
50 topics covering NVIDIA H100/H200/Blackwell, AMD MI300, Apple Silicon, Intel Gaudi, TPUs, Trainium, Cerebras, Groq, the GPU software stack (CUDA, Triton, ROCm, NCCL), inference engines (TensorRT-LLM, vLLM, llama.cpp, MLX), memory/interconnect (HBM, NVLink, InfiniBand, RDMA, CXL), edge AI, and AI data centers.
Explore AI Hardware →AI Frameworks
50 topics covering deep learning frameworks (PyTorch, TensorFlow, JAX, MLX, Flax, Lightning, fastai), LLM/RAG (HuggingFace Transformers/Diffusers/PEFT/TRL, LangChain, LlamaIndex, DSPy, Haystack, Semantic Kernel), distributed training (DeepSpeed, FSDP, Megatron, NeMo, Ray, Composer, Axolotl), classical ML (sklearn, XGBoost, LightGBM, pandas, Polars), specialized (RAPIDS, PyG, spaCy, OpenCV, YOLO), and MLOps (MLflow, W&B, ClearML, DVC, Kubeflow).
Explore AI Frameworks →AI APIs
50 APIs covering frontier LLMs (OpenAI, Anthropic, Google, xAI, Mistral, Cohere, DeepSeek, Qwen), open-model hosting (Replicate, HuggingFace, Groq, Together, Fireworks, Perplexity), cloud AI (AWS Bedrock, Azure OpenAI, Vertex AI, watsonx, Databricks, NIM), voice & speech (Whisper, ElevenLabs, Deepgram, AssemblyAI, Cartesia), image/video gen (Stability, Flux, DALL-E, Imagen, Runway, Luma, Pika, Kling), and specialized (Assistants, Computer Use, Exa, Tavily, Browserbase, Jina, Voyage, Mixedbread).
Explore AI APIs →AI Models
50 model deep dives: frontier closed LLMs (GPT-5, Claude Opus 4.7, Gemini 2.5 Pro, Grok 4, o-series, Mistral Large 2), open-weight LLMs (Llama 3.3/4, DeepSeek-V3/R1, Qwen, Mixtral, Gemma, Phi-4, DBRX, Falcon, Yi, Nemotron, Command R+), image generation (SD 3.5, FLUX, DALL-E, gpt-image-1, Midjourney, Imagen, Ideogram), video generation (Sora, Runway Gen-3, Luma, Kling, Pika, HunyuanVideo), audio (Whisper, ElevenLabs, Suno, Udio, F5-TTS), embeddings (text-embedding-3, Cohere v3, BGE-M3, Voyage), and specialized (CLIP, SAM 2).
Explore AI Models →AI Tools
50 tool deep dives covering AI coding assistants (Claude Code, Cursor, Copilot, Aider, Continue, Cline, Windsurf, Replit Agent, Devin, Tabnine, Cody, Zed), app/UI builders (v0, Lovable, Bolt, Replit, Magic Patterns, Codev, Polymet, Tempo), chat & writing (ChatGPT, Claude.ai, Gemini, Grok, Notion AI, Jasper), productivity (Granola, Otter, Fireflies, Read.ai, Glean, Mem, Reflect), design (Adobe Firefly, Figma AI, Canva, Krea, Recraft, Magnific), video (Descript, Synthesia, HeyGen, Runway, Veed), voice (ElevenLabs Studio, Suno, Resemble), and search (Perplexity, Arc/Dia).
Explore AI Tools →AI Use Cases by Industry
50 industry deep dives covering healthcare (providers, pharma, biotech, devices, mental health, insurance), financial services (banking, IB, insurance, wealth, fintech, lending, crypto, accounting), retail (e-commerce, stores, fashion, beauty, grocery, QSR), manufacturing (discrete, chemical, automotive, aerospace, semis, mining), energy (oil & gas, renewables, utilities, nuclear), transport (logistics, aviation, rail, last-mile), real estate, public sector, education, media, sports, telecom, and hospitality.
Explore by Industry →AI Startup
50 deep dives for AI founders covering ideation & validation (idea filtering, market sizing, customer discovery, MVP scoping, WTP, wedge), product & engineering (strategy, MVPs, stack, build-vs-buy, evals, cost, latency, reliability, open-vs-closed, telemetry), fundraising (pre-seed to Series B+, decks, valuations, SAFEs, strategics), GTM (motions, PLG, enterprise sales, pricing, sales team, marketing, content, DevRel), growth (analytics, retention, infra, CS, land-and-expand, international), team (hiring engineers/researchers, org design, equity/comp, remote/office, founder wellbeing), defensibility (moats, data flywheel, IP, competing with big labs), and legal/exit.
Explore AI Startup →AI Ethics & Governance
50 deep dives covering foundational ethics (frameworks, utilitarianism vs deontology, virtue ethics, moral agency, cross-cultural), bias & fairness (sources, metrics, auditing, BBQ benchmarks, mitigation, hiring/credit/criminal-justice fairness), privacy & data rights (GDPR, CCPA, differential privacy, federated learning, right to explanation), transparency (XAI, SHAP/LIME, model cards, ISO 23894), accountability & liability, safety & alignment (RLHF, Constitutional AI, x-risk, mesa-optimization, mech interp), regulation worldwide (EU AI Act, US, NIST RMF, ISO 42001, Singapore, UK, China, UNESCO), and sectoral ethics (healthcare, criminal justice, hiring, education, warfare).
Explore AI Ethics →System Design
20 courses on AI system design: RAG, LLM apps, recommendation engines, ML inference, multi-agent systems, and interview prep.
Explore System Design →AI Projects
20 step-by-step build projects: RAG chatbot, fraud detector, voice assistant, MLOps pipeline, and more. Full source code included.
Explore Projects →Interview Preparation
20 courses: ML coding, theory, system design, LLM/GenAI, behavioral, company-specific prep, salary negotiation, and more.
Explore Interview Prep →Coding Exam
20 courses: DSA, dynamic programming, NumPy/Pandas/SQL/PyTorch challenges, ML algorithm implementation, and timed mock exams.
Explore Coding Exam →AI Certifications
19 exam prep courses: AWS, Azure, GCP, TensorFlow, Databricks, NVIDIA, Hugging Face, LangChain, and more. 500+ practice questions.
Explore Certifications →AI Prompts
Curated prompt templates for coding, writing, data science, DevOps, career, and more. Copy and use with Claude, ChatGPT, Gemini, or any AI tool.
Browse AI Prompts →AI Testing
20 courses on testing AI systems: model validation, LLM evaluation, adversarial testing, bias detection, data quality, RAG testing, and ML pipeline testing.
Explore AI Testing →AI Security
20 courses on securing AI: adversarial attacks, LLM prompt injection, data privacy, threat modeling, red teaming, zero trust, and governance compliance.
Explore AI Security →AI Automation
20 courses on AI-powered automation: CI/CD pipelines, RPA, AutoML, workflow orchestration, anomaly detection, document processing, and DevOps automation.
Explore AI Automation →AI Architectures
20 courses on AI architecture: transformers, CNNs, RAG patterns, multi-agent systems, microservices, edge AI, model serving, and distributed training.
Explore AI Architectures →Why Choose Lilly Tech Systems?
Built for developers, students, and professionals who want practical, hands-on tech education.
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100% free tutorials accessible to everyone worldwide. No login required. No paywalls. Just learning.
Self-Paced
Learn at your own speed. Every course is structured so you can start, stop, and resume anytime.
Hands-On
Every lesson includes practical examples, code snippets, and exercises you can run immediately.
Multi-Device
Learn on desktop, tablet, or mobile. Responsive design ensures a great experience on every screen.