Best Resource to Learn Linux

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What is the best online resource for a beginner who wants to learn Linux? Maybe you can name one source of free material and one paid source?

I am already doing some basic stuff for work, but I would like some practice labs or “problems” to fix in addition to reading books and watching training videos.

I know I can search for this myself online, but my problem is not a lack of resources but rather an abundance, and not knowing where my efforts would be best placed.

I have watched your videos on Linux, thank you for them 🙂