re: Baldurs Gate III - Any tips?

Along with what others have mentioned...

- Do side quests. Do all the side quests. Stop the main quest to do side quests. Not only are they fun and add a little something extra story-wise, you can get some decent loot from many of them and you get extra xp from all of them (which then makes boss fights and big battles a bit easier).

- Hoard health potions even if you have a healer in your group. At some point you will get into a situation where you will wish a given character had a health potion to help them survive a fight.

- Camp and rest up (which will autosave) after every encounter (if possible, at some points you are not able to camp). There's no penalty for this (even though the story in the game makes you feel like you need to rush).

- Many of the fights are more than just point-click-win, they will take a good strategy. This can come from the terrain itself, placing items (like exploding barrels) in specific spots before a fight, having certain characters and/or abilities in your group, etc.

- Since you mentioned a Rogue, also horde lockpicks and trap triggers (for disarming traps, can't remember the exact name at the moment). Also, there is a pair of gloves you can get access to early on (Act 1, not sure where though) that gives you advantage on lock-picking. My character is a Bard (which is part-rogue) and has these, rarely misses being able to pick a lock.

- Make sure all your characters have both a melee weapon and a ranged weapon (even if they can use magic).