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The best parametric CAD tutorials I found were those for OnShape.
Onshape and Fusion360 both have tons of great tutorials available, and they are completely free for non-commercial use. There is a reason those are used by almost everyone in the 3d printing community.
“And they are completely free for non-commercial use.” I have seen both of their “community” or “maker” tiers get worse over time; the terms of those licenses becoming less permissive. I’ve been told by an Autodesk employee that it doesn’t exist for Fusion360. “There is no free software here.” I suggest against building anything that matters to you against those platforms.
As long as you don’t need much, they are free. But, the good stuff is all pay to play.