How do i join friends in gta online?

The Wikipedia entry for Grand Theft Auto Online describes the game as an online multiplayer action‑adventure that allows up to 30 players to explore an open world. However, it does not contain any detail about the mechanics for joining a friend’s session, inviting friends, or using the in‑game friend list. Because the evidence is limited to the general multiplayer description, no concrete steps can be given based on this source. For specific instructions on how to invite or join friends, additional sources would be required.