"Advanced Techniques"
I'm not that keen when books have a section of "advanced techniques".
Often "advanced" really means "hard to do". A book should show how to get a job done. If you need to know it, you have to cover it -- and the fact that its "advanced" makes no difference. If you don't need to know it, then you can either cut it out or -- if it's fun / useful -- include it near the end. Again, the fact that it's advanced makes no difference.
If you mean by advanced "optional, but useful". If that's the case, call it that. Or if it means "impressive stuff", then that's even better -- call it that.
"Advanced" doesn't work well as a way to organize information because readers don't know if something is "hard" or not when they try to find out how to do it. For example: "Making my site secure". I don't know if that's easy ("basic techniques") or hard ("advanced techniques"). I just know I need to do it. So which part of the book should I go to for that?
What do you expect to see in the "advanced techniques" section of a book?