The Search Bar in AutoCAD’s title bar can be customized to include your own library of tips and tricks and other documents you may have accumulated. The less than convenient limitation is you must link each file individually.
You can also add a link to an RSS Feed through the Communication Center. The disappointing limitation is RSS Feeds are not searchable from the Search Bar in AutoCAD.
I strongly recommend you clear the check box that hides posts older than xx days as shown in the Communication Center’s settings dialog and let the info flow.