Editing on Wikipedia is collaborative. Many people will collaborate with you to improve articles, whether by correcting minor typos or by adding images and large sections of well-referenced content. This tutorial shows you how to keep abreast of changes made to articles.
There are three basic approaches. The broadest approach is create a "watchlist" of articles that interest you. Such a watchlist records the most recent change in the each article, listed in reverse chronological order. A second, more focused approach is to examine the history of edits made to a single article. The third, less common approach is to compile an list of articles that interest you, and then click on the "Related changes" link in the lefthand column.