To have a piece of any length to play, we need more than one, repeated eight-bar chord sequence.
In music harmony, this different section is sometimes called 'the B section' (or 'strain') - 'B' just to indicate that it's different to the 'A section/strain'.
Here's your reference performance of the B strain.
Here's the first teaching video.
This is the 'string of thirds'.
Here is the bottom note of the triad added (with the left hand).
Here are the triads played with just the right hand.
Here are the left hand (bass) notes added in.
We repeat the 'B strain', and it ends differently the second time.
Here's the first and second-time music - just the last four bars.
Congratulations! That's a lot of concentrated chord work. Working through this build-up, say, four times will give you a firm foundation for the next module.
You should be able to play through the full sixteen bars in you head, seeing and hearing the chords and knowing what fingering you're going to be using.
Now go on to the next module for an object lesson in how to practice new material like this.