Larian Studios Forums Baldur's Gate III Baldur's Gate III - Suggestions & Feedback [SUGGESTION] Add PHB to the game

As a newcomer to DnD, but not RPGs in general, I would also like to understand just what this 5e rule set IS that everyone is talking about.
However DnD has been around for years so the sheer amount of books and reading material there is out there, is an overwhelming thought. I don't want to delve that deep into the rules and mechanics, but having more basic instructions would be nice. My husband has played the Baldur's Gate games before and some of the other DnD-ruleset-based ones, so he explained it to me, but when I first started playing I was so confused.