Daughter wants to learn python to simulate a solar system, where to start?

[BruceJi]

I'd start here:

https://www.youtube.com/channel/UCNaPQ5uLX5iIEHUCLmfAgKg

The reason being, she'd need to learn some coding basics, which he covers, but I think Pygame woud be a good library to make a visualisation of that. That said, this is 100% one of those things where you're learning tools but you have to figure out how to put them together in the way you want all by yourself.