Not sure if this counts, but the way I chop my onions and garlic changed after watching a Joshua Weissman video on it. Leaving the end on to hold it all together while I chop was so genius I don’t even remember how I chopped them before. Especially easier to thinly slice onions. Also learning my spices so I can spice mostly by smell. Makes it easier when I’m experimenting to just smell the pan and know which spice I should add to make it taste better.
That and a VERY sharp knife