I've been playing with cards since I was in preschool and taught myself a lot of shuffles and card handling but there are plenty of videos online for modern students. I like to mix things up in the same shuffle and alternate Faro/perfect, overhand, riffle, and cutting several times to really be sure I've randomized my deck. I don't have much confidence in overhand shuffling alone but I like it between others and that's also the shuffle I end with. I usually overhand a few times at the end until it feels right.
I've read that to fully randomize a 52 card deck, 7 riffles is what to aim for. Less than that is not adequate and more than that improves it only insignificantly or negligibly per time. I've read that overhand shuffling would require thousands of shuffles to randomize a deck of just 52 cards so I don't rely on that.
So, why don't I just do 7 riffles and be done with it? I enjoy they way I do it, I enjoy handling my cards. And I'm sure to get in enough riffles (I count Faro as a form of riffle) to satisfy the 7. The cuts and overhand are more for the energy and flow. Oh, and pleasure.
When I'm doing a series of questions for the same person on similar aspects I only overhand a few times, until it feels right, for each new spread.
Just a note: 8 perfect shuffles in a row returns the deck to the starting order but that is the opposite of what I'm trying to do.