While I have built my knowledge largely based on using the internet to search out what I want to know (w3schools.com helped a lot, as did A List Apart), a few good books have helped me along the way, though they have been platform/language-specific, so I'll avoid mentioning them unless someone is curious. For me, at least, having a book open so that I don't have to resize windows or switch between them is very valuable.
The first part of your list is ok, but the last few items need tweaking. ASP.NET adds server-side functionality (for the most part) to your application. This lives outside of the browser and is thus quite powerful and easily shared with a variety of end-users.
The problem (some say) with server-side processing is that your application must make a new HTTP request when you ask for an action to be performed. So if you click on a link to a page that yields a new set of data, you don't get instant results. The page reloads, or loads a separate page.
Javascript solves this to a degree--it allows you to respond to user input instantaneously. Do you want to display the sum of two numbers when the user clicks a button? You can do it with Javascript.
The problem with Javascript is that it can't talk directly to databases, or explore your server's file system, or other stuff like that. It lives in the browser--period.
AJAX bridges the gap between your user's browser and your server. With AJAX, Javascript makes the HTTP request without refreshing your page or loading a new one. Javascript talks to a server-side script (not necessarily ASP, either--works with PHP, Rails, Coldfusion, etc.) and sends and receives information. And because Javascript isn't dependent on page loads, a quick, snappy AJAX script can almost give the feeling of a common desktop application, in which you don't have to wait for HTTP requests when performing simple actions on your application's data.
