Transgender and gender diverse (TGD) children, adolescents, and their families are increasingly seeking out pediatricians and mental health providers for education, treatment, and services related to gender-affirming care. TGD children, adolescents, and their families are looking for care that is welcoming, affirming, and safe. However, due to a lack of training and information about providing gender-affirming care, providers may feel unprepared to offer this level of care to children and adolescents in TGD communities. This toolkit is a curated list of resources created by the National LGBTQIA+ Health Education Center to aid medical and behavioral health providers who are either starting on their journey in gender-affirming care for TGD youth or are looking to refresh or further their learning and understanding of creating safe, supportive, affirming health care experiences for TGD children and adolescents.