Have questions about exactly what permaculture is?
It can be confusing sometimes, especially since it's extremely similar to any general sustainability. A lot of the theory mainly gives a name to a natural practice that we already do. The "Principle of Energy Cycling" for example, is a good way to describe how we use our garden waste for compost, then use the compost to grow the garden.
As @permiedotnet says, permaculture is the cutting edge of a 10,000 year old practice.
Even if you already engage in sustainable practices, there is still always something new to be learned from permaculture. For example, I never knew that edges are naturally more diverse areas, or how important it is to pay attention to where water collects on your land.
If you'd like to know more about what Permaculture means, or maybe even have a brief workshop or something like that, this factsheet posted by @sandrastorr is a good one. It's simple, well organized, and illustrated: http://www.idepfoundation.org/download_files/permaculture/Fsheet_Perma_eng.pdf