I am in session 7 of my rewatch, so this was the first connection I made a well. 🙂
Have a look at https://www.picoctf.org/
They have a lot of challenges and resources to get you started.
Your xargs comment is still wrong tho. It deletes ALL but the most recent two files.
They get most of their money from google for the “default search engine deal” make of that what you want. For me personally it doesn’t sound fully independent.