It may be your math background is weak; quadratics involves a fair bit of algebraic understanding, if you’re missing that, you’re going to struggle with a topic built on that concept. Make sure your foundational knowledge doesn’t have gaps.

If you get stuck on a given step, figure out why — is it a problem with understanding quadratics, or a problem understanding algebra, or factoring, or even just addition? This will give you an idea of what other areas of math you need to brush up on.