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Understand Whole Tones.
A Whole Tone, also called a whole step, is the interval movement of two semitones moved apart to the left or right from the note that is played.
Examples.
For example, C to D:
Starting on C, moved two semitones to the right to D.
The interval between them is a whole tone( or whole step).
Notice we skipped playing the black key in between and played the next white key.
That’s because it takes two semitones to get a whole tone.
…
On G to A:
Starting on G, moved two semitones to the right to A.
The interval between them is a whole tone.
Last example. This one can be tricky because there is no black key in between.
It is a white key to a black key, but if you can see it’s still two semitones apart giving you a whole tone. Example below 
On B to C#:
Starting on B, moved two semitones to the right to C#.
The interval between them is a whole tone.
Extra.
Now that you have learned semitones and whole tones.
You can construct the major scale.
The C Major scale is made up of semitones and whole tones.
If starting at C:
The scale goes as follows.
C, D, E, F, G, A, B and lastly back to C, completes the C Major scale.
If you unmute the video you can hear the notes being played.
Can you hear how natural this scale sounds? It is more soothing to hear, unlike the Chromatic Scale. Right? Right on 
.
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