Hi @Tj ,
By default in Blender, the numbers on your Numpad are to change the views. The ones above the letter keys are, in Edit Mode used to switch between Vertex, Edge and Face select. Also CTRL+2 adds a Subsurf Modifier of level 2, when not using the Numpad keys.
When you don’t have a Numpad, you can set your Preferences to use Emulate Numpad:

When you don’t have a Numpad, you can set the tilde action to Navigate to get a Pie Menu for the Views:
