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.
Choose Your Learning Path
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 →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.
Free & Open
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.