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One of the best places to learn about these is on css-tricks:

I usually prefer text to video tutorials, but for me one of the best introductions to Grid was this video from Mozilla:

Seeing it like that really made me appreciate how much boilerplate Grid could let you cut back on.

Also "Flexbox Froggy"

Yeah. That’s much nicer than the references; gives you a nice intuition for it.

And its grid counterpart Grid Garden. https://cssgridgarden.com