What tutorial?
Yes, it'd be cool if in a potential tutorial there was a gang invitation tutorial: the server invites the player to a gang, the player types '/gang join', some canned chat is thrown at the player demonstrating the feature, some radar demonstrations showing that gang blips show up more opaque on radar.
Tutorial is all cool in theory but just thinking about what to implement and how it'd all be implemented nicely is a lot of work. The gamemode is a mess, it was not designed with the intention that it'd get this large, not to mention there is still not a decent Pawn editor for SA:MP.
then stop the developement