Other POCUS resources
I find this resource to be wonderful: POCUS - ER - SickKids with great Youtube videos.
There are also some interesting resources on these websites:
Lu, Jimmy C., et al. "Recommendations for Cardiac Point-of-Care Ultrasound in Children: A Report from the American Society of Echocardiography." Journal of the American Society of Echocardiography 36.3 (2023): 265-277.