[thundergolfer]

Thanks for the answer. I haven't learned that much about this topic, but most of what I have learned is from reading E.D Hirsch Jr.

Who would you recommend I read next?

[tdekken]

It depends how far down the rabbit hole you want to go :). I highly recommend checking out APM's documentaries on this issue (https://features.apmreports.org/reading/). These are in-depth and accessible.

If you want to go further, you can read Moat's Speech to Print, Seidenberg's Language at the Speed of Sight, and many others. If you want to go even deeper, then welcome to the firehose that is educational research :D.