Although I have not specialised in counselling for children and adolescents so I only work with people over 18 years of age, many times people bring issues from their childhoods, or they may be worried about behaviours they see in their own children.
UK Trauma Council offers some excellent free resources on:
at https://uktraumacouncil.org/resources, where you can even watch short but comprehensive videos such as this one on adverse childhood events and how the brain copes: https://youtu.be/EFrfBJrVLbE