Ok this is probably a boring start to the list. It is perhaps not a hidden gem to anyone. But, I’ve seen too many people not following the coding style conventions. I know it is your code, but if you are planning to share it any time in future, you probably want others to like it and find it useful. I think one of the most important factors of an open source project is readability. And perhaps the very first step to having a readable is to follow the conventions and styles that people are used to. This is probably the only place that you don’t want to be super creative.