Learning and beside browsers Development tools!

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Some times it was difficult to me to understand how exactly a method or function really worked ("what you get") with elements from outside ("what you see").
So I helped myself exploring with Development tools  (F12 on MS browsers, Ctrl+Shift I on Chrome etc.)

I don't remember that there is any place where it is explained how to take advantage of them for a better understanding of languages and happenings!

 

I guess that could be nice for learners to have some topics related to them developped and explained!