You seem a good person to tell the OP about 1e to 5e differences, as presumably you’ve played a lot of both more recently than most folks.To a degree. I played a little hybrid 1st/2nd edition, and a very little 3rd edition, but I played mostly 1st edition then 5e. I played other RPGs in the intervening period.
I haven't played 1st edition since 1986. I just didn't play much D&D in between.You seem a good person to tell the OP about 1e to 5e differences, as presumably you’ve played a lot of both more recently than most folks.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.