The list of recommendations in this new GigaScience paper by Janna Hastings et al. is not aimed at bioinformatics in particular, but many bioinformaticians would benefit from reading it. I can particularly relate to this suggestion:

Document everything
Comprehensive documentation helps other developers who may take over your code, and will also help you in the future. Use code comments for in-line documentation, especially for any technically chal- lenging blocks, and public interface methods. However, there is no need for comments that mirror the exact detail of code line-by-line.