Consider this ECG course run by Amal Mattu – it is digital and can be taken at your time –

https://courses.ccme.org/course/theheartcourse/self-study?utm_source=CCME+Newsletter&utm_campaign=bc5b145669-Heart+Course+12&utm_medium=email&utm_term=0_5f7c9f8444-bc5b145669-420889377#open_444