Hey guys!

I am a FMG (MD from abroad) who just completed his training. I am 27 yo, and I just completed my GP training in my home country; however I will sit the medical residency admission examination on September (I will also sit the USMLEs, bc of fellowship purposes only). I intend to apply to Anesthesia (A 3 year long residency program); however I am aware that I won't be able to work through 100 hours/week once I hit my late 60s, so I was hoping if anyone could tell me of some smart ways to invest my money once I join the workforce, so as to generate passive income ... I might add that I don't mind learning other trades (Always had a knack for math, chose at the last minute medicine bc I genuiely want to help people) TL:DR: What to invest my money in once I start generating income?