The visual editor provides a semi-WYSIWYG (What You See is What You Get) content editor that allows you to easily create, edit, and format your blog content in a view similar to that of a word processor. Here are some sites that I believe provide useful information to get started with the WordPress visual editor:
This is one of the more detailed walkthroughs of the WordPress visual editor that I’ve found.
This post is for you if you would prefer not to have to keep reaching for your mouse for basic formatting.
I’m including this link more as an honorable mention. Most of WordPress.org’s documentation is fantastic, so don’t let this discourage you.