Your kids might like https://www.codingame.com/start/
Kevin Powell has quality front end material. Jack Herrington has quality general and backend material for JavaScript and Typescript.
I’d suggest App Academy Open or The Odin Project to get both instruction on the basics and practice projects to work through.
Any YouTube channel is insufficient. You need to practice.
FYI, I cross posted your question to three Programming.dev communities:
Shell Scripting
Python
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