How do you learn a new subject beyond your subfield? (Note that you can choose multiple answers)
Ask a colleague who works in the relevant subfield for the basics and the references
Look into Wikipedia (or another encyclopaedia, for that matter) and then follow the references and the links found there
Pick up several books on the subject and go for a bout of reading until you "see the light"
Pick a single book or paper and dig through it until you begin to understand it
Other (please leave a comment with details below)
The results of this poll are here. Thanks for participating!