And no smartphone in your pocket, of course.

You can use KeePassXC (with a dedicated vault or not), synced by another mean (Nextcloud, Syncthing, Git, etc.).

Certainly not the best, but codecademy is decent. After that, it should be enough for you to learn more deeply from official Python documentation, actual Python code base (from OSS repositories), and specific subjects from blog articles.

But it will highly depend on what type of content you like. For example some people may prefer books over interactive courses. If this is your case, i think this one is recognized as a very good one: https://learnpythonthehardway.org/python3/

Can you explain it to me like i'm a 10 yrs old (which i'm not 🙄), then?

You won't see the end of these crapwares until there is centralized managment console with it, sadly...