Playing Baldur's Gate 3 for the first time can be intimidating, especially to those who aren't well versed with Dungeons & Dragons. The game has so many systems, that you'll probably spend the first 10-15 hours figuring out how it works, and that doesn't include all the time spent in the in-depth character creator.
I might have proficiency in Charisma, but not in Rizz.
Baldur's Gate 3 follows a modified version of the D&D 5E ruleset, so if you're not much of a TTRPG player, many terms and features may seem alien to you. Spell slots, enemy classification, the difference between a short and long rest, there's a lot that could confuse players. However, even after almost two years, some players are struggling to figure out all of the game's features.
The success of the game speaks for itself when new players are trying the game even today. However, while most of us have figured it out and had multiple playthroughs, these green players are still trying to wrap their heads around it. As you can imagine, the first thing everyone struggles with is spell slots.
I, too, was so confused by why I couldn't perform my spells...