Another dimension to this for beginners, is understanding the multiple layers of tracks and styles.
And I'm still bemused by the 3 x choruses format. Which 'popular songs' in the last 70 years have a chorus but no verses? Less than 1% I'm sure.
Several thousand tracks by accomplished musicians, but no obvious support for verses. Am I missing something?
You missed the jazz terminology that BiaB uses. In jazz a chorus means play the entire song. Commonly the first chorus one played the melody, the second chorus was for improvisation, while the third was back to playing the melody. Of course there were variations in this theme. Playing the chorus in jazz means, in today's terms, play the verse, chorus, prechorus, etc.
FWIW, I also use the unfolded method in BiaB. That is where I have 1-n x 1 which means start at the first measure, n means the number of measure in the song, and x 1 means play it one time. Don't fret over n as you can change that while figuring out you song. I also label each section via the bar based section letters: Right click on the measure number to get to the bar based section letters. I use I for intro, V for verse, C for chorus, etc.
PS - BiaB started as a jazz program thus the chorus terminology.
I hope this helps.