I have been using Linux as my daily driver for quite some time (around 5-6 years) and usually manage to get whatever needs to be done. However, I now wish to learn it in a more structured manner, which includes understanding utilities and the workings of Linux. What resources should I look out for?
I would look for something interactive e.g LFS but in containers (or VM or WASM VM) with checkpoints with instructions, something risk free yet hands on.
Not for books.
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I would agree, and IMO the most important aspect that makes arch good for learning is the amazing wiki