Debugging tools and methodologies

[mastermind1385]

I'd like to improve my debugging skills and become more proficient in maintaining and enhancing software systems (I'm a python developer though), so, I'm here to ask for maybe some practical strategies, including specific debugging tools and methodologies, that you've found particularly effective for debugging complex software issues and tracking down elusive bugs in a large codebase. It would be better if it is sth from your experience.