I hit a quest breaking bug a while back and stopped playing as i didnt have a save before the bug. Currently restarting fresh. Obviously I plan to make alot of saves this time. However, would appreciate if someone could advise me which quests to be most carefull with. Any advice?
With v3.32 there is a known issue with Victoria's kids on Android. For all plaforms you need to have the decensor patch to enable some content, but that isn't game-breaking if you can't access it. Other than that all quests are stable (though some can be more difficult to suss out and/or require a number of steps to complete).
Unless you edit/mod the game files, that can bork even things unrelated to what you changed/modded.
There are three questlines which let you reset girls if you lock them out: vampires if you burn them up
in the Burial Grounds, Oksana if you don't lie to her
after killing Master, and Vixenatrix if you
steal the gem & survive. During the quest "Get Past Granny" you have a choice which affects later Mia content, and you cannot reset that choice other than going back to an earlier save and choosing a different option.