How do you make gta 5 online MOD?

Creating mods for GTA 5 Online is against Rockstar Games' terms of service and can lead to bans or account suspension. However, if you're interested in modding the single-player version, you can use tools like OpenIV and Script Hook V to create and install mods. Always ensure to back up your game files before modding and only use mods in single-player mode to avoid penalties in online play.