ELI5, is reviving your car bad?

Question

Preface: I know nothing about cars, like nothing at all. In car movies they always rev their cars to be cool, but I’ve heard people irl say it’s bad to do. Is it? If so, why? Explain simply please because I don’t know enough about car mechanics to understand otherwise; I don’t know car terms either.

In: 2

Answer 1

When cold, yes because the engine is not lubricated properly, but when warm it’s fine to give it some revs just don’t sit at redline for 3 minutes.