that Umbrel guide is still my go to for my first node.
I worked so hard for that guide and during an entire year I improve it every day, debugging, testing, watching what others were asking and find the best simple solution for them and put it together into a nice "troubleshooting guide".
That link posted on SN in 2021 was only the first draft... kept on telegra.ph page (telegram notepad) because those times I was helping a lot of noobs over telegram. Then I moved to Umbrel community forum where I posted thousands of posts again.
Helping noobs is not only about to throw them some complicated CLI commands, but also to listen what they are doing.