How to enlarge an object to only one side of Blender?

Question

Blender

If I use S (scale), then the object is stretched in both directions

Answer 1

You can set the 3D Cursor as the Transform Pivot Point, and choose any position for it, incl. one of the faces of your object.

Answer 2

If you press X, Y or Z after S, it will only drag along the selected axis.
Or, conversely, you can exclude one axis Shift + X (Y, Z)

Answer 3

You can move the pivot to the cursor (put the cursor on the extreme point). After that, the increase in the object will occur from this point.