Here is a list of helpful resources if you are interested in reading more:

Books (General parenting)
Becoming the Parent You Want to Be by Laura Davis and Janis Keyser

Books (Parenting children with special needs)
Parenting Children with ADHD by Vincent Monastra

An Early Start for Your Child with Autism by Sally Rogers, Geraldine Dawson, and Laurie Vismara
Books (Behavior)
I Brake for Meltdowns by Michelle Nicholasen and Barbara O'Neal

No More Meltdowns by Jed Baker

1-2-3 Magic by Thomas Phelan

Positive Discipline for Preschoolers by Jane Nelson

The Explosive Child by Ross Greene

The Incredible Years by Carolyn Webster-Stratton

Books (Activities)
The Preschooler's Busy Book by Trish Kuffner

Kitchen Table Play & Learn by Tara Copley and Andrea Custer

Books (Sleep)
Healthy Sleep Habits, Happy Child by Marc Weissbluth