How do large language models like ChatGPT actually learn to write?

Large language models like ChatGPT learn to write by practicing a lot, just like you practice your spelling or reading.

Imagine you have a robot friend who wants to learn how to write stories. Every day, this robot reads lots of books, from fairy tales to funny jokes and even instructions for building toy cars. The more it reads, the more it understands how sentences are formed and what words go together. This is like learning the rules of a game by watching others play.

When the robot reads a sentence, it tries to guess the next word or letter in the story. If it guesses right, it gets a little happy. If it guesses wrong, it learns from its mistake and tries again. Over time, this robot becomes really good at predicting what comes next, just like how you get better at spelling by practicing every day.

The robot uses practice and feedback to learn. It's not magic, it’s just a lot of hard work, one word at a time!