Shape Keys

1. Add a mesh 
2.  In object mode, go to the object data (triangle) tab 
3. Click the plus button under Shape Keys (Basis will appear in the box)
4. Click the plus button again to add Key 1 
5. In edit mode, select a vertex (or multiple vertices)
6. Press "g" and move the vertex
7. Go back to object mode
8. Under the shape key box there will be a value slider
• slide it to make the vertex move
• make sure slider is back to zero before adding another shape key