For a beginning look at the
Principles of Permaculture,
I refer you to David Holmgren's website, one of the founders of this field.
I have no Permaculture Design Certificate (PDC), yet! But I have been utilizing permaculture methods in gardening and landscaping for almost 10 years. Many permi books in we own and apply concepts often. The above digital badge from OSU was awarded when I completed the Intro to Permaculture MOOC with Andrew Milison, in which I created a Permaculture Design for out ~1/2 acre in Ontario, OR. The background photo here was taken during an Earth Day Celebration installation. Though Im experienced, I still desire taking an intensive PDC sometime soon.