Almost all editor icons represent states for creating new GOs. In the left toolbar, there are some icons which represent icon groups (Points and decorations, Bézier curves, etc). Click the group icon to expand all the icons contained in the group into the right toolbar.
In the descriptions of the GO creating modes, we also give a list of type, subtype, hanger and anchor terms (canonical names). You can ignore them unless you are interested in the Scheme; in that case, they give you useful information about the GOs.