Hello! The “How to build a brain” book is the best textbook for learning Nengo. It has a mixture of explanations on theory and practical examples showing how to build different networks in Nengo. Note that the book came out a few years ago so some of the code examples are out of date, but you can find updated versions of all the examples inside the nengo gui. Start up the gui (by typing
nengo), then click on the folder icon in the top left, then built-in examples, then
You can also find the course notes for a course that introduces students to Nengo and the NEF here http://compneuro.uwaterloo.ca/courses/syde-750.html.