Learn the languages behind the things you build.

The first two lessons are guided tutorials with practice questions. The remaining modules are planned. Examples are illustrative and do not execute code.

1. LESSON 01 · Guided lesson available

   How Code Works

   Recognize source files, syntax, running programs and different execution environments.

   Practice: Locate a .ts file and explain what executes it.

   Prerequisites: None

   Open guided lesson →

2. LESSON 02 · Guided lesson available

   Programming Concepts

   Read variables, types, functions, conditionals, loops and collections.

   Practice: Trace a tiny function's inputs and output.

   Prerequisites: how-code-works

   Open guided lesson →

3. LESSON 03 · Planned

   JavaScript Essentials

   Explain functions, objects, events, promises and asynchronous behavior.

   Practice: Predict and compare two function outputs.

   Prerequisites: programming-concepts

4. LESSON 04 · Planned

   TypeScript Essentials

   Understand type annotations and why builds can reject invalid types.

   Practice: Fix an argument type mismatch.

   Prerequisites: javascript

5. LESSON 05 · Planned

   HTML & CSS

   Distinguish semantic page structure from visual styling.

   Practice: Identify a heading, label, layout and focus state.

   Prerequisites: how-code-works

6. LESSON 06 · Planned

   Python Essentials

   Understand scripts, modules and common automation use cases.

   Practice: Read a simple file-processing script.

   Prerequisites: programming-concepts

7. LESSON 07 · Planned

   SQL Essentials

   Read SELECT, WHERE, JOIN and database relationships.

   Practice: Write a read-only query against sample account data.

   Prerequisites: programming-concepts

8. LESSON 08 · Planned

   Language Explorer

   Compare language ecosystems by task and constraints, including Go, Rust, Java and C#.

   Practice: Select two reasonable choices for an example project and explain tradeoffs.

   Prerequisites: how-code-works

9. LESSON 09 · Planned

   Frameworks & Runtimes

   Differentiate React, Next.js, Node.js and platforms such as Vercel.

   Practice: Label each part of your current portfolio stack.

   Prerequisites: javascript

10. LESSON 10 · Planned

    Choose the Right Tools

    Pick a suitable language, framework and runtime for a concrete problem.

    Practice: Design a small sourced-data workflow and justify its stack.

    Prerequisites: frameworks-runtimes, sql

Language & technology explorer

Languages, frameworks, libraries, runtimes and platforms are different categories. Compare what each does and where it fits.

function greet(name) {
  return "Hello, " + name;
}

console.log(greet("Builder"));