I don’t know if I would recommend a comprehensive guide at all tbh. It’s like recommending a comprehensive guide to gardening or reading or something. Just start small with realistic goals and find some good YouTube videos that pique your interest.
I started with unraid (strictly due to the expandability of the array, and I’m still glad I did that) and found SpaceInvader One’s videos to be super helpful, and he continues to put out new videos with new ways of harnessing unraid’s power. After a while I got the hang of it and now I feel comfortable reading the docs of a service and installing it myself and integrating it into my stack. Following communities like these on Lemmy, as well as perusing the Community App Store in unraid is more than enough to expose me to interesting software I want to try out.
I say sit back and enjoy the process. We have a tendency to put pressure on ourselves to do things perfectly and immediately. But tend not to enjoy the learning process. Thinking back five years ago it’s amazing how far my server has come, let alone my ability to control it. Enjoy it!
I’m sure syncthing works great for you but another option is Self Hosted Live Sync. It works for me as an iOS user who can’t use syncthing on my phone. It requires a server but given this b community it shouldn’t be a surprise.
https://github.com/vrtmrz/obsidian-livesync