Tips for a newbie.

Hey, after a very, very long time, way over 10 years now, I'm looking to get into AoE2 again.

I kind of know a bit about the game, I know about build orders, kind of remember a few of them, etc. But... I can barely remember hotkeys, no way I can remember unit/tech/etc costs now.

I was wondering what a good way to start would be, like what should I do to get ready for actual matches against other players? I remember going in blind on SC2 and yeah that didn't work. I know there are some videos with general tips on YT but I'm not sure what would be a good thing to achieve before going online, some special AI I should aim to beat maybe?

Thanks in advance.