Getting started with linux

Exactly where can i start to work with linux from scratch on toradex, I am a beginner, and using linux for a year, knowing how linux works and basic commands. I wanna dive deeper in to the linux kernel administration, kernel customization and compiling. don’t know where can i start because there are vast of topic in knowledge base but I still miss something. I need help on Make files modification, driver customization and simply from stratch.

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