I don’t Nextcloud currently, but I have considered it. Currently I have everything I want on a drive connected to my docker box, and if I need it I SCP it to or from that server. My need for files stored at home isn’t exactly huge. But nextcloud or similar is in the pipeline.
I am on the move often too, but because I can VPN into my network, and use the pihole+unbound DNS on my GrapheneOS phone all the time, I always have access to my stuff.
The reason videos aren’t recommended is because they quickly go out of date. Text is easier to update, and so are screenshots.
The wiki is the most comprehensive guide you will find.
However if you don’t know what you are looking for help on, it is best to search up what issue you are having, then consult the wiki when you learn the terminology you needed to find the page.