Well obviously you have to choose YTers whose looks you like, take notes from the YT videos on products you liked the look of and then get advice on specific products (if you are buying high end) from the counter, AND add a good dollop of common sense.
But I am in my 40s and totally overhauled my makeup last year and all the best advice ime was on YT. They will tell you the best brands for concealer, powder etc, whether the dupes are any good or you need the branded one etc. They will give you precise demos of make up applications inc for hooded eyes.
Wayne Goss is short and snappy and has great tips
PixieWoo have huge variety of looks and are heading towards 40
Lisa Eldridge more classic looks, also 40ish
Tati (US) will tell you exactly how to apply on that hooded eye, as will
HotandFlashy (also US) (terrible name I know)
amodelrecommends has some good tutorials actually, but she is more lifestyle I think, than pure makeup.
They are the ones I go back to a lot but if you are searching on a specific problem plenty of others will have hooded eye videos and sometimes you have to watch a variety on a specific issue or technique before you get it. Practice NB. There were people who would do one side badly and the other side well, and those videos actually taught me a lot.
You definitely need to know your own face and skin. Are you cool toned or warm? Dry or dehydrated? There's videos on that stuff too.