[alfiedotwtf]

Literally the Hanon set of books will teach you this :)

But if you’re a hunt-and-peck for piano, I would recommend stop what you’re doing and go back to the very beginning and relearn everything properly so that you don’t have any bad habits.

As for other resources, this app looks like a good bet!

[sixo]

No they don't teach this, that's the problem! The exercises are good but the right technique is v different from what Hanon describes.