The more experienced you get at programming with a specific language and/or framework, the more likely you are to get stuck in a pattern of solving problems the same ways over and over again. Odds are that other people have figured out better ways to solve the same problem and someone, somewhere, is talking about it. You have to at least observe the community, even if you are not participating in it yourself.
One of the best ways to follow the community is to follow the prominent figures in it. For example, for Swift, it is a great idea to follow Chris Lattner, the original creator of Swift. While numerous people now develop Swift, he spent more than a year as the sole developer and continues to run the Developer Tools department at Apple. You can follow him on Twitter @clattner_llvm and it can also be useful to follow his activity on Apple's Developer forums at https://devforums.apple.com/people/ChrisLattner. You can click on the Email Updates button to get emails about...