Help:Contents
Making a small change is simple: once logged-in, click the Edit button at the top of a page or next to a section title, make the appropriate change to the text, add a brief summary to explain why the edit was needed, and finish by clicking the Save changes button - done!
There is a quick-start guide for what to do when noticing an error on the wiki. The contributor's guide and the wiki editing guidelines provide advice on how to make quality edits.
For the occasional quick fix, don't worry too much about formatting or style though, the important thing is to fix errors or add missing info to the wiki.
If having any trouble getting started, there should be people willing to help on IRC, in the #gentoo-wiki (webchat) channel (just be patient, replies can take a very long time).
Note that some articles are protected from public edits, such as the handbook and project pages. Issues on these pages can still be reported though.
The wiki help pages provide useful information about using the Gentoo wiki (as opposed to documentation for Gentoo itself, which the Wiki contains).
These pages contain information for readers (click here if just browsing the wiki), though the bulk of the content is for