I would suggest checking https://www.youtube.com/@DungeonDudes if you are about learning how to make the most out of it. The guys know the rules quite well and know how to build quite powerfull characters. Its more than you need for for BG3, but I feel like if you check their videos about feats and some adivces for multiclassing you should know what are considered to be power builds and then you can see for yourself how much you are willing to deviate from it.
Personally I think you won't need min-maxing as much as people claim it. If you have a specific playstyle you might get some odd combinations going that are still efficient. But if you want optimized builds there are a few well-known combos that you can find on that channel or probably here.
