Baldur's Gate III

• Pay attention to the tooltips for spells to see if they have a "ritual" tag on them--if they do, you can cast them outside of combat for free, meaning there's little to no downside to using certain spells like Detect Thoughts or Talk with Animals, which makes interactions with NPCs a lot more fun. Just be wary of Concentration spells since you can only have one on at a time.

• There is a lot you can do mechanically that is both useful and not immediately apparent. Furniture can be moved and stacked to climb up on stuff. Pushing and jumping are actions available to everyone and used constantly. Spells or items that spread something on the floor can often be comboed with other spells. Make sure you look over what you have in your bag and around you before just charging into a fight.

• You can go to and from your camp without resting at any non-combat time, so don't horde junk in your inventory, just send your 50 daggers to your camp til it's time to sell them.

• Throwing a potion applies the affect to everyone in the area, whether it's positive or negative. This applies to healing potions too.

• You can talk to someone with one character and then switch to another to do other things that the NPC isn't supposed to see you doing.

• Spoiler for time limits:
  Despite what the game tells you, there isn't an actual time limit except for occasions where someone says something will happen the next day. Long Rest at will.

• You can re-spec every character at any time for 100g once you get a character very early at camp so expect to experiment. The only thing you can’t change currently is your appearance and race. Stats, classes, feats are all changeable and mechanically you do character creation again and then level back up to where you were.