The use of half steps suggesting the movement from one key area to another is called

The use of half steps suggesting the movement from one key area to another is called: Chromatic scale
in order to play a chromatic scale on a piano, you need to determine the root where the scale is set semi-tone apart, and played your way up from one not and hit every key up to the octave.

White flour this don't make sense

Aa i believe is the answer to your question