As stated in the video, Modes are 'Sections of a Scale'.
They are not the Scales.
The Scale is the division of the intervals or 12 tones we use.
The modes are the sections of that Scale. Sometimes you have to say it a few times
In this example we are using A as the 1, F#m as the 6, Bm as the 2, and E as the 5.
You might notice that it is all the same scale or it appears to be the same mode just missing notes to make the different modes. That is actually all that is happening.
Lets look at the same mode with the target noted Highlighted
Hopefully what you have just learned is the Target notes throughout the Chord Progression 1-6-2-5. Repeat this logic over all Chord progressions you learn in the future.