BUILD UNDERSTANDING

What will you learn next?

Pick a technology. Follow a short lesson. Put the idea into practice.

Choose your next learning focus.

Select a technology to see its lessons, interview preparation, and your saved place.

Explore all technologies

Explore technologies & skills

Languages

JavaScript

Understand scope, functions, objects, and asynchronous execution.

Open learning path

Languages

TypeScript

Use types to model data, narrow values, and build safer interfaces.

Open learning path

Frontend

React

Understand rendering, state ownership, hooks, and performance.

Open learning path

Frontend

Next.js

Connect server rendering, routing, caching, and client boundaries.

Open learning path

Backend

Node.js

Understand the runtime and build reliable HTTP APIs.

Open learning path

Backend

Express

Trace middleware and handle failures across the request lifecycle.

Open learning path

Backend

NestJS

Learn dependency injection, validation, and application structure.

Open learning path

Databases

MongoDB & Mongoose

Model documents and reason about indexes, queries, and consistency.

Open learning path

Databases

SQL & PostgreSQL

Work through joins, transactions, query plans, and relational correctness.

Open learning path

Architecture

System design

Learn architecture trade-offs before tackling design scenarios.

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Production

Security & performance

Protect application boundaries and investigate production failures.

Open learning path

Production

Testing

Choose useful tests and understand mocks, fixtures, and coverage.

Open learning path

Production

Git

Build confidence with branching, history, and recovery.

Open learning path

Production

Docker

Understand containers, images, networking, and safer builds.

Open learning path

Production

Delivery & cloud

Connect pipelines, cloud fundamentals, and deployment troubleshooting.

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Engineering

Code review

Review unfamiliar code for correctness, security, and reliability.

Open learning path

AI Engineering

Build from LLM fundamentals to RAG, LangGraph agents, secure workflows, and production AI systems.

Open learning path

Problem solving

Data Structures & Algorithms

Learn the patterns behind interview problems, then implement them in JavaScript, Java, C#/.NET, or Python.

Open learning path

Architecture

Deterministic AI Workflows

Separate language understanding from business control to build reliable, auditable, and testable AI-assisted workflows.

Open learning path

AI Engineering

MCP Server with TypeScript

Learn MCP from protocol fundamentals to secure TypeScript servers, production deployment, portfolio projects, and interviews.

Open learning path