Exciting you’re interested in the terminal. Personally I find it an invaluable tool, it’s powerful and versatile, suitable for almost any task. So as you learn, I’d encourage you to be concious about what you find interesting or fun, whether it is the coding-, problem solving-, automation-part, or an entiely different aspect.

There are several gamified introductions to programming, scripting and using the shell, which may be a good start. Some of my favourites (off the top of my head) are:

• “The Bandit” on Over the Wire to get familiar with the basics of the shell (terminal).
• Rustlings a collection of small exercises, and a great intro to tge Rust programming language

Somehow I love the name Sea-Rex

I think the people behind Session cares for their mission, and it might align with OP’s, so maybe. Although I personally am not too fond of about all their choices.

The omission of Forward Secrecy for instance doesn’t sit well with me. Each to their own though, and they do go into their reasoning on their blog: https://getsession.org/session-protocol-explained

Likewise their last audit from 2021, lists quite a handful of critical/moderate issues in their apps, hopefully they’ve fixet it. Afterall it’s been a while since 2021. https://getsession.org/faq#security-audit