It’s been a loooong time since I’ve played MS. I saw a friend on earlier and wanted to give it another shot. Are there any recommended resources for me to use to give myself the easiest onboarding process to get up to speed again?
There are a few YouTubers that have guides for most of the systems in the game. Ereklo_Gáme has quite a few, they have videos about nearly everything in the game. Scardor also has a bunch of videos going over the in game mechanics and systems. Coppersan has a new player guide and also has a ton of content for new and early game players. All of them also stream on Twitch and welcome new players to join their chat and ask questions.
As for written guides, there aren't a ton because they become outdated pretty quickly, because of that, I think YouTube and Twitch will be your best bets. Hopefully some of this information is helpful for you.