one in between I don't understand the concentration at all, etc. there is an easy guide to the rules when I look at the Ad & D rules 5 that kill me, there is not a rough guide tailored to BG3, at least the one who is really overdue, thank you if it is somewhere any help in this regard is difficult for beginners.
You make a concentration check every time you take damage.
In BG3 you also lose concentration when you get prone.
The purpose of concentration is that you do not have tons of spells active at once.
In DnD 2E and 3E sometimes pre buffing took longer than the fight itself.
Prof. Dr. Dr. Mad S. Tist 
