Networking
I am a firm believer in the power of networks. If you really want to investigate something, or need to gain knowledge of something specific, join a group of other people with the same interests as you. Spreading knowledge through networking is a powerful tool in learning new, or improving existing, skills.
Discussion groups
At work we have professional network groups that deal with specific topics regarding programming, programming languages, architecture, scrum, and other IT-related matters.
I manage the network group that deal with functional programming languages, and the group is populated by people who have a keen interest in learning techniques in functional programming as well as new technologies.
I also manage a discussion group at one of Denmarks largest IT-newspapers – Version 2 – dealing specifically with the functional programming language F#. You can find the discussion group here (danish only).