Literature review - A critical assessment of the work done so far on this topic—to show how the current study relates to what has already been done.

Topics 1.0API integration 

1.API integration (one page)

2.Caching external API requests (one page)
3.Pulling live data into a spreadsheet (one page)
4.Creating graphs based on trends from data (one page)

do a page a topic so total 4 pages

You can include diagrams if you wish, or feel is necessary and its up to if it counts towards page completeness you seem to know what you're doing so it's your call

quality is most important