How do I properly rename my project and its builds and stuff like that?

I have a Unity project that I randomly named when I first started it, but now I want to change the name of the project and the builds and stuff like that to a more appropriate name so that when I do eventually end up putting out a version of the game for other people to try it’s actually named correctly.

How do I go about doing this?

In the Player Settings you define the name of the app.