So before getting straight into things... I will start by saying, i reccommend you download a 3rd party viewer, such as FIRESTORM
OF COURSE, if you want to use any other viewer, that's ok! This guide will be using FIRESTORM.
If this sounds confusing, you access second life in a similar way you access the internet,
a VIEWER is similar to a WEB BROWSER, so you can log in from official or third party VIEWERS, and it'll still be the same grid.
FIRESTORM for example has various improvements upon the default viewer including extremely customizable UI.