I just wanted to mention this here. I recently stumbled upon this and the guy from the teachingtech youtube channel has created an in my opinion great guide to step by step calibrate your 3D printer.
I haven’t tried it myself yet as I’m still waiting on my SM2 to arrive, but it looks super handy and very useful. It covers almost every topic I’ve read about here that could be solved by calibrating your printer.
PS: I don’t have any affiliation or benefit from posting this here, but I thought it could come in handy for new printer owners. I’ll definitely be trying it myself.
Hope this is useful for someone.