Here you can digest how to use Wikipedia in bite-sized morsels. The tips listed below were created for the Tip of the day project, or the Styletips project, but are listed here by title and organized by subject area for your convenience.
The semi-automated article peer-reviewer checks pages against some basic Manual of Style (MOS) rules and generates a quick report.
It can be enabled as a Gadget in your user Preferences. Check off the box for: MoreMenu, adds Page and User dropdown menus...
After you save and purge your Preferences you will now have a tab on every page called Page. While you are at an article, hover on Page; hover on Tools; click on Peer reviewer.
"Tags" are often used to indicate problems. Some Wikipedia editors object to the practice of tagging instead of fixing, but there is value in pointing out an article's problems. Tagging allows editors to specialize, teaches editors and warns readers about subpar or problematic content. It is better if people solve the problems they encounter themselves, but not everyone may be able to. Editors are sometimes obliged to justify inclusion of tags, such as in the case of Template:POV.
Constructive criticism given in a civil, respectful manner is a vital part in a collaborative project like Wikipedia, and it should be welcomed rather than discouraged. Wikipedia values contributions from everyone—novices and experts alike. It is important to listen to readers who find an article biased, confusing or unconvincing. They might not have the expertise to fix those problems, but the fact that they report them probably means that an article needs improvement.
For a listing of current collaborations, tasks, and news, see the Community portal. For a listing of ongoing discussions and current requests, see the Dashboard.