A really cool way to display your photos is to use one of the Photo Grids. These are aesthetically pleasing arrays of photos in a fixed arrangement.
To find the grids, tap on the + (Add) button then the Photo Grids icon. Now select a grid from one of the folders and tap to add it to your doc. The grids are available in a number of configurations - so 16:9, 4:3 and then a range of other variations - just explore the folders to find one you like.
Replace the placeholder photos in the grids by dragging and dropping an image from your file explorer, or, select the photo and tap the Replace option - then choose from one of the options on the Replace image menu as above.