I go for the man page first, then to a book on the language, then to the web. I work with many people (who are by far my senior) who never never check man pages and never search the web but go around bugging others for very simple things. Just this week I was asked how to find and replace text in a document and told to email them instructions.

This can be rephrased more generally: Effectively utilizing available sources of information is one of the most important skills for every engineer.