How to Programm a Coustom Command that Starts something in the 1.20.1

[Verteex]

I want to programm a small mod for a mini game. The command should start the mini game and a Timer ,but i can't find any tutorials for that for one of the recent minecraft versions.

Thx in advandce

Edited January 29 by Verteex

[vemerion]

11 minutes ago, Verteex said:

but i can't find any tutorials for that for one of the recent minecraft versions

I think the easiest way to learn about commands is to look at the vanilla commands. Commands.java is probably a good place to start.