What are quantum computers ?

I have seen many youtube videos, they are saying about quantum computing, super position, qubits(They are saying that a bit can 0 and 1 at the same time - but how ? - The transistors can either switch it on or off) and i have no idea what they are talkin about. I am an intermediate programmer and i have a bit knowledge about hardwares. Can someone explain this to me in a way that's easy to understand, or provide some sources I can check out?

do i need to a basic understanding of quantum physics to understand this concept ?