I've been using Mint for about 5 years now and want to explore the 'nuts and bolts' side of it a bit more

I can use the terminal a bit- copy/paste code to install programmes etc, but I'd like to now understand what the code actually means

Can anyone recommend either a book or online guide to exploring this? Also can any recommendations be geared towards newbie and 'moron' level

If this community isn't the right place let me know and I'll repost elsewhere.....

also many thanks in advance for any help 👍