Having been in a similar situation, looking back there are a few things I would recommend.
As well as writing lots of notes I would add asking questions. You can get away with a lot of questions when you are new. I didn't ask as much as I should. A few months down the line I realised there were some areas which still confused me and I felt awkward asking at that stage as I felt I should be expected to know.
I had a long notice period from my old job and I wish I had done more research on my new organisation during that time. I'd looked at their website but only the main sections. I realised later that there is a ton of information on there which I kind of had to swot up on when I first started. I wish I'd been a bit more familiar with the background to the organisation before starting. It's probably obvious to a lot of people but having spent 14 years at the same company, the process of moving industries was unfamiliar to me.
I was a bit homesick for some of the people when I started. (I still miss close friends from my old job and haven't made the same kind of friends in the new one, as nice as they are, they are very much colleagues and not friends). However, with hindsight I wish I'd moved job sooner. I had been stuck in my comfort zone for too long.
As another poster said up thread, it is really tiring. Be prepared for that. I wasn't! Also I changed jobs pre-pandemic and found the longer commute tiring and kept coming down with colds in my first few months which didn't help. It may be easier in some respects working from home, but tiring in others if you have to have a lot of Zoom meetings.