Summary  
This chapter explains how to declare and manage mutable (`let`) versus immutable (`const`) variables in JavaScript and outlines best practices for clear, descriptive naming.

General domain of usage  
Game development (e.g., tracking player scores and maximum players)

Variables let you store data that can change, while constants store values that should stay the same.
Use:
- `let`: when the value can change;
- `const`: when the value should not change.

let score = 10;
score = 15; // value can change
console.log(score);

const maxPlayers = 4;
// maxPlayers = 5; // ❌ error

### Best Practices
- Use `const` by default;
- Use `let` only when needed;


## Naming Variables
Use clear and descriptive names:
```js
let playerScore = 100;
let maxLevel = 10;
```
Avoid:
- Starting with numbers;
- Reserved words;
- Unclear names like `x` or `data`.


### Why This Matters
Variables are the foundation of everything in JavaScript.
You'll use them to store user data, application state, and results.

Aprenda a controlar la lógica del programa, estructurar datos y construir funciones dinámicas utilizando JavaScript. Trabaje con funciones, arreglos, objetos y bucles, luego aplique estas habilidades para crear un sistema de perfil interactivo. Adquiera los conocimientos fundamentales necesarios para avanzar a React y al desarrollo frontend moderno.

Aplica tus conocimientos en un mini proyecto, aprende los conceptos básicos de depuración y prepárate para los siguientes pasos en JavaScript.

Variables y Constantes

Best Practices

Naming Variables

Why This Matters