Vertex Commands
These commands allow you to perform complex operations on vertices. For example, you can insert an edge between two vertices by the Insert Edge command. Or you can merge vertices by using the Merge Vertices command. These command are found in the Command Palette when the Component Selection is set to Vertex and you have a vertex or multiple vertices selected. The Command Palette is located on the right side of the screen right below the Camera Controls (see below).
Modeler Interface

Isolation Commands
Isolate
Tap this button to isolate (solo) the selected mesh and make the rest of the scene invisible and locked.
De-isolate
Tap this button to de-isolate the selected mesh and unlock the rest of your scene and make it visible.
Selection Commands
Grow Selection
Tap this button to grow the selection.
Shrink Selection
Tap this button to shrink the selection.
Invert Selection
Tap this button to invert the current selection and select all connected vertices that are not selected.
Select Shell
Tap this button to select all connect vertices to the current selection.
Clear Selection
Tap this button to clear the selection.
Modifier Commands
Add Subdivision Modifier
Tap this button to add a subdivision modifier.
Remove Subdivision Modifier
Tap this button to remove the subdivision modifier.
Add Mirror Modifier
Tap this button to add a mirror modifier.
Remove Mirror Modifier
Tap this button to remove the mirror modifier.
Modeling Commands
Knife Tool
Tap this button to activate the knife and cut to create new faces, edges and vertices.
Align Vertex
Tap this button to activate alignment mode. Then tap or drag on another mesh to align the selected face to that mesh's surface.
Insert Edge
Tap this button to insert an edge between the selected vertices.
Insert Edge only shows up when you have two vertices selected.
Merge Vertices
Tap this button to merge the selected vertices.
Merge Vertices only shows up when you have two vertices selected (no more, no less).
Destructive Commands
Delete Vertex
Tap this button to delete the selected vertices.
Dissolve Vertex
Tap this button to dissolve the selected vertices.