Welcome to the club,
since I was in a similar position as you a few years ago, I actually missed some proper guidance from the internet. Most of them would be like "yeah, everything just works", without explaining to you what you actually need to do.
These are my favorite switch friendly apps:
Magnet - you have the windows 10 feature of moving windows around, perfect for larger screens
Lightshoot - I was using Greenshot on windows, works better there, but Mac OS doesn't have it, so check lightshoot out.
Learn how to use icloud.com:
Whenever I'm not at my mac, I just open icloud.com, log in with my apple ID and take/edit the documents which I need. Good stuff.
Learn how to use "desktops" with the touchbar:
I have spend years in getting use to the "taskbar" of mac os, until I figured out that you shouldn't actually use it as the traditional windows taskbar. The smartest thing which you can do is have one desktop with your smaller apps in normal mode (I have skype, calculator, calendar and fb messenger), the second desktop with your main app in full screen (mine is Safari), the third desktop with your second app (mine is photoshop), and then you just swipe left/right, depending on what you need, and not going with the mouse to the taskbar to actually "click" on it.
Dual monitors are not working the same as on Windows, learn how to use them:
Same thing as above, if you're working with an external monitor, like I do, then I would suggest you a similar setup as above. On the monitor you have the two main desktops in full screen, where you swipe left/right, depending on the need. And on the mbp monitor you have the small apps. That way you're using the touchpad and keyboard from the laptop, the laptop screen is providing you with the smaller apps, and the external monitor is providing you with the full screen apps. I also sometimes combine Magnet to have two apps on one desktop, so that I can switch around if I need to compare something.
Don't game on your mac if you have been gaming on Windows
Just don't, you'll be disappointed. I owned an iMac with a good gpu, and it's just not the same experience. I don't know why but the mouse feels weird, I think it's because of the mouse acceleration which you just can't disable (or bring to work like it works on Windows). If you really want to play games, install windows on it on a smaller partition.
Don't update your system immediately
I update my apple stuff at least 4 weeks after the update has been released, in most cases you get the main update + a smaller one which came a week later since they discovered some stupid little bug.
I'll update if I remember something else, but as of now, I think these were the main problems which I hade.