Technical Program Manager (TPM) courses

Hi All, I’m planning to start prepping for TPM roles and looking at few good online courses for the same. I see a bunch of courses in Udemy and other online sources but would like to seek the opinion of folks here for some good coursework/start point. Can you please help on how to start the prep and courses that are good which I can undertake? Thanks! TC: 200k #tech #TPM #technicalprogrammanager