_ _
READ THE WHOLE THING.
We get asked the same questions over and over again, and it gets old very quickly. Virtually everything you need to know is explained here.
General Questions & Roles
Q1. Can playing FiveM get me banned from GTA:Online?
No. FiveM is installed in a completely different folder and only reads the GTA files, but does not alter them in any way. So as far as the Rockstar services are concerned, you are playing GTA5 single player.