We are interested in any contribution. There are many ways how you can contribute:
You can contribute interesting examples/tutorials.
You can blog about how you use SfePy (let us know!).
You can help with improving our documentation and these pages.
To get acquainted with SfePy, you can start by reading the Tutorial and Primer sections of the documentation and trying out the examples that come with the sources. Your first contribution could be pinpointing anything that is not clear in the docs.