More and more often I come across orders to perform certain functions of the site using AJAX. The topic is popular, I agree, especially since many people associate it with Web 2.0, and to my shame I still have not got a hand in this area.
I know about the existence of several popular libraries, I even felt something, but this is not what I need. As usual, I want to write myself. Well, or at least understand the level.
Therefore, the request to all good habrachelekam - help tighten this annoying gap in knowledge with advice, a link or an example. And then I myself.