I’m a good chemist, but not IT advanced. Started using Debian out of the box last year on miniPC. Running Jellyfin only on that local machine. Don’t understand coding, but copy/ paste terminal instructions from trusted sites. Have 1TB music, films and documents. Want to move all photos from Google.
The traditional way is man pages and howto guides, which contain loads of information. You can get man pages in terminal or html (but I can remember how).
Next up is online tutorials like you are using, however with complicated setups, like a full mail server, the info gets very specific and can often go out of date.
Then we have readthedocs, which are the project specific instructions which tend to be very good.
How ever my personal favourite is the arch wiki, you’ll need to know how to change commands to Debian based systems, but it does give a lot of info and insight that is up to date.
For moving from Goole photos look at photoprism, immich and nextcloud, there are others, but these are the ones that made my short list
This is valuable, thank you