Hi! I'm a former neuroscience researcher and child-adolescent development specialist. (I currently teach teachers and parents about optimizing brain development through an understanding of growth mindset, resilience and attachment).
Website: One of my favorite sites is the Harvard Center for the Developing Child
Article: I wrote an article on my blog that covers some key ideas you might find helpful! I try to write in a 'user-friendly' way, so hopefully it can give you something useful :-)
7 Things You Need to Know About Childhood Trauma and its Connection to PTSD
If anything - it lists other references to check out!
Animated videos: These two animated videos also cover toxic stress
How Fear and Stress Affect the Brain (I created this one- it's not the greatest but has some basics)