Yeah, in particular the lines:
* Creating AJAX contact form
* Building AJAX registration/login forms
Maybe it's just me, but that language kind of reminds me of the copy-paste era of Javascript development, where developers who don't understand JS semantics jump right into messing with login systems. Like 10 years ago it would have been "Building DHTML page counters". OFC I don't know if that impression reflects the actual material or not, though.
IMO if you're going to tell someone how to build AJAX contact forms, you would be better served writing a library to do it for them with a comprehensible API that makes it hard for people to fuck it up, or to start by explaining the basics of jQuery AJAX and selectors and event handlers and let people build the idea themselves from solid foundations. If someone really groks jQuery (or even vanilla JS), writing a contact form is a little tedious but not something that needs a tutorial or guide.