I think aiming to understand the „how and why“, at least a few levels deeper than directly obvious is what helped me in a debugging and fixing a lot of things.

I think aiming to understand the „how and why“, at least a few levels deeper than directly obvious is what helped me in a debugging and fixing a lot of things. Having a deeper understanding of your tools, your environment and the problem at hand helps me a lot. When a library you use does something unexpected, or is missing documentation, dig in, read that code, debug it. Understand the details of your programming language of choice, not just the basics. It takes time and requires a certain level of curiosity, but, at least for me, I think it pays off.