For me personally, my 2 legends in some of the frontend / fullstack learning that I came across are
Netninja and rwieruch
And I did share both of their free content in this channel previously.
My logic on this is simple - I know what to expect, I used their free material and liked it, sometimes with what I learned from them helps me in my daily job that I'm being paid for and as a thank you I am happy to buy something from them (although I know I could find for free)
This is just a small note that rwieruch has a discount currently and I thought I'll have a look at his "The Road to GraphQL", should be fun.
If you decide to get one, the code that worked for me with 40% off was
BF2020PS this is not a promotion, this is kudos to the guy 🔥 you can find his website yourself