Base game list?

I was scripting according to the wiki on wiki.garrysmod.com (something like that) and it said to make things easier you use bases of gamemodes. i.e. if someone was making an advanced build server and they didnt want to code the WHOLE thing.

basically what i am asking is for a list of base gamemodes that beginners like myself can easily pick up and expand on.

Fretta.

Thanks alot!