# Phase 5: NLP, Foundations to Advanced

> Language is the interface to intelligence. Master every layer.

## Start this phase on GitHub

**Prerequisites:** Phase 2 Lesson 14, Naive Bayes. Python 3.11+ is enough for
the first lesson.

**First lesson:** [Text Processing](01-text-processing/)

Run this command from the repository root:

```bash
python3 phases/05-nlp-foundations-to-advanced/01-text-processing/code/main.py
```

Keep the command, exit code, token list, stems, lemmas, and one example where
stemming loses meaning but lemmatization preserves it.

**Next action:** Add one sentence with punctuation and an irregular verb,
inspect the result, then continue to [Bag of Words and TF-IDF](02-bag-of-words-tfidf/).

Browse the [full Phase 5 lesson list](../../README.md#phase-5) or the
[cross-phase roadmap](../../ROADMAP.md).