What is a good resource to find out about making custom walkers?

I stumbled across this article, I think it could be of tremendous use to you. It helped me understand it a lot better.

I believe there was a question on here in which (I think) @Rarst answered that linked to it, but I can’t seem to find it. If someone can find it and edit my answer in place of this that would be great!

EDIT: Found another pretty good resource you can find here.

EDIT: More excellent resources below you can look through. I made the ones that are extremely useful in my opinion bold!

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