Oh yeah dont worry about that, its actually pretty easy to fix! If you accidentally made someone mad you can sort it out at the church of vows, its over in liurnia of the lakes. The thing youll need is called celestial dew, which you can grab from a few different spots - i usually get mine from the merchants in ainsel river, or theres some in nokron if youve made it there yet.

When you make it to the church, just use the celestial dew at the big statue inside, and itll reset any npcs that are mad at you. Just keep in mind though, if you actually killed someone, this wont bring them back to life - learned that one the hard way! The good news is that even if you did permanently mess up some npc quests, you can still finish the main story just fine.

Tip for anyone interested - if youre dealing with important quest npcs like white-faced varre or sorceress sellen, definitely try to fix things before they end up dead, since their quests can have some pretty cool rewards. Getting to the church might be a bit tricky at first, but once you beat that red wolf boss in the academy, its pretty straightforward to reach.