I just started it last week!
Splitting time between that and FF7 Rebirth.
Still not comfortable with the combat yet so I’ve just been just talking my way out of possible combat situations…or just fleeing lol.
The beauty of the D&D/BG3 combat is that just about any combination of party members is viable, so just have fun with it.
Early on, Grease (bottle or spell) and anything that creates an ice surface (spells, scrolls, staves, cantrips, arrows) are great for crowd control. You can also chuck a bottle of alchemist fire on the grease to light it up and cause fire damage.
Generally, if you need healing in combat, use potions. The exception is on a downed ally - it's good to use a spell (or toss a healing potion on them, or help them up if you're standing next to them) because it gives the enemy an extra distraction (and helps prevent character death). Outside of combat, use spells. Aid is especially useful as it increases your HP max and lasts until long rest.
Focus fire is a valid strategy, especially against magic users or strong opponents with multiple attacks.
Buffs and debuffs are fun but not necessary unless you're on Tactician or higher. My faves early on are Bane and Bless.
You can dip your weapon in any element around you (fire, poison, grease, ice) or any vial you may have in your inventory. Great for extra elemental damage.
Stealth attacks are great and can achieve two things - major damage, and "surprising" the enemy so they lose their next turn.
Think creatively. There are so many ways to win battles. Place explosive barrels in strategic locations and blow them up. Shoot down hanging objects onto the enemy. Shove them into the abyss. Toss them on another enemy. Funnel them through a door and create a chokepoint.
If you have two or more party members right next to each other in the initiative order, you can take their turns in any order.
Also, side note, send any food or camping supplies you pick up straight to camp. They won't clog up your inventory and are always available to you when you camp.
Happy slaying!