It all depends on what you are trying to do with the information. Additional reading on promises, TDD, or anything else will help you become a more well-rounded developer. If you are more focused on going through lessons to complete projects, maybe it’s better if you just save the links somewhere and come back to them later if you need them.
I think one should read the articles (in addition to any official documentation about the specific programming languages). I think it helps one get a more rounded education from other sources/resources too.