All of the above. I peruse the internet on all sorts of sites including blogs, pinterest, You tube, forums, and ceramics specific sites. I also get subscriptions to Ceramics Monthly, Pottery Making and Clay Times. I buy books that I am able to peruse, or find multiple positive reviews about. I have bought, and been given DVD of ceramic specific information. I use the local library, and if really in need go to the college library. I am trying to get to more workshops for broader exposure, I love museums, and anything I can find about clay, but everything in general. I sponge it all up, hoping to retain as much as I can. However, I do have specific memory problems, even though I recognize when I have seen something before, or relate the work to a style, or some more historic precedent, for the life of my I can't really remember names of artists, or most people in general. Especially when stressed, or queried about them.
If I am stumped, usually I go into "cocoon mode" protecting myself from outside distractions, and feeding on information specific to the problem. After a lot of time of thinking and mentally solving the problem in multiple ways, I experiment with the best options until one works. Many times this gestation process involves sketches or flow charts, outlines or other organizational devices to help me visualize the situation.