Get to Know: Shazam!
https://www.dcuniverse.com/collections/get-to-know-shazam
Competitor Highlight: Justice League Dark
https://www.dcuniverse.com/collections/comp-highlight-jl-dark-row
I will no longer be updating this. You can use the search engine now.
However, I am working on a massive reading order document which may include collection links, especially once public list are shareable.