These are some great resources for training and educational materials we highly stand behind.
Everyone should start here! Regardless of your training method. Adele focuses on R+ training however she comes from a background of the show world. This is never about one training method being better than another but I guarantee you'll have a new perspective just by starting to understand horse learning and behavior from this one course, regardless of how you train.
https://academy.thewillingequine.com/share/cxPxS2N-9aV5-wFo?utm_source=manual
This is a book you can purchase and read but is also available on audible. Highly recommend either way.
Audible: https://www.audible.com/
Amazon: Horse Brain Human Brain
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