# LLMs, tokens, Git and GitHub (/docs/ai-agents/llms-tokens-git-and-github)

---
type: Document
title: LLMs, tokens, Git and GitHub
description: The first concepts of the AI Agents module, what an LLM is, what a context window and a token are, and what Git and GitHub do, as taught in Class 1.
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added: 2026-10-04T17:06:26Z
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sources:
  - id: ai-agents-class-01
    title: "AI Agents module, Class 1: Introduction"
    resource: "iSkills AI Agents Class 1 notes, introductory class, taught by Sir Tanveer Nandla and Sir Faheem Akhtar"
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*This whole document is from Class 1 of the AI Agents module, the part
taught by Sir Faheem Akhtar.*

## AI models and LLMs

- **LLM** means **Large Language Model**. LLMs are trained on **billions**
  of data, and you can use them for your own work.
- **ChatGPT** and **Claude** are the names of **apps**. **Opus**,
  **Sonnet**, **Astra** and so on are the **LLMs**.[^ai-agents-class-01]

## Context window

Every LLM has a specific **context**: a capacity for how much data it takes
in. If a model's window is **1M tokens**, that LLM can process 1M tokens of
data.[^ai-agents-class-01]

## Tokens

A token is the model's **scale**: how many words' weight it can carry. The
easy way to think of it is that usually **1 token = 0.75 words**, so **4
words are 5 tokens**.[^ai-agents-class-01]

## Git

- **Git** is a **version control system**. It keeps your work shipped.
- Say you did some work yesterday, and five days later you want to see what
  a file looked like five days ago. You can see that through Git.
- Git puts **checkpoints** in place. It takes **snapshots** of the code's
  history.
- Every time you **commit** while coding, a checkpoint is made, and you
  write a **comment** there, so that the changes you made can be read
  later.[^ai-agents-class-01]

## GitHub

**GitHub** is file storage, or code storage. Just as a computer or a drive
has **folders**, GitHub has **repositories**.[^ai-agents-class-01]

[^ai-agents-class-01]: iSkills AI Agents Class 1 notes, introductory
    class, taught by Sir Tanveer Nandla and Sir Faheem Akhtar.