Pillars of Eternity 2 does this well. There are tooltips all over the place - any word in the text that is related to either a game mechanic or lore has an explanation when you hover over it. I think (it's been a little bit) you can look up the rules if you need a more detailed explanation. And most of the loading screen text is reminders about some of the easier-to-forget keywords, so game concepts get reinforced all the time.