Advice for someone who only played Diablo 2 classic, who wants to move on to try Diablo 4.

I was in a classic clan called Quizer for many years. We only had expansion installed for the higher resolution. I've only played hammer dins, blizzers, and TPK barbs. I don't even know what a rune does.

I've seen some of the items from Diablo 4 in forums and it looks nothing like what I'm used to. Should I give D2 expansion a try, move on to D3, then start D4, or would I be fine going right to D4 and just have a steep learning curve? Any advice would be appreciated.