These two videos show you how to create a list of items that are in a data file (a list of images in this case) and then also to dynamically generate pages from that data file. This is similar to what we did in class with the Clients pages.
These work with the eleventy starter files
Create Grid of Image Cards from images.yaml file
This video walks through creating cards to display images from data in the images.yaml file.
Create Pages Dynamically from images.yaml Data File
This video shows how to make a generate.md file that will dynamically create pages for each image in images.yaml. You could use this same technique for showing blog posts or other pages.