The best way to learn the basics of health policy in this country is to learn our nation's unique system. Why bother starting with England or Germany, you won't be exposed to all the goody ol' cornerstone American concepts like Medicaid federalism that are much more important to learn. It's just too confusing to start int'l; that should be reserved for advanced studies. Too big of a risk of disinterest the other way around. We don't need to lose more students like this
Ha! OP, this viewpoint is very naive. For you science-minded folks, this would be the logical equivalent of saying that we should study signal transduction pathways before understanding the utility of a membrane, running clinical efficacy trials on humans before testing drugs on model organisms like mice, or studying alkynes before alkenes in an organic chemistry class (just because they "seem" more interesting). Health policy (and especially US health policy) isn't some token field that you can cover in a one-hour session or book or an opinion piece. It's extremely nuanced topic -- in my opinion, orders of magnitude more complicated than a cell biology or a genetics course -- and a topic for that matter which is poorly understood by external stakeholders in healthcare (policymakers, too many physicians, the general public). A severe lack of interest and appreciation for health policy among so many physicians in particular, due to the structure of medical school curricula, is largely responsible for the monstrosity that is the American healthcare system right now, IMO.
If I were in your shoes, I would start off with a book on the fundamentals of health policy (if you're interested enough in the topic -- if not, that's totally fine), and I would just understand that (1) creating policy involves a lot of cultural, economic, and political contextualization (in other words, no singular type of health system is suitable for every community/state/country), (2) healthcare financing, payments, and structure resulting manifests as a continuum between completely privatized and completely public care (no country lies at either extreme), (3) healthcare systems, along this continuum, create different sets of "winners" and "losers," when considering who is paying into them and what they are getting, and (4) no country on the planet, despite what anyone will tell you these days, has "figured out" healthcare -- period.
Hopefully this helps! If you're studying this topic for the sake of medical school interviews, I'm sure that if you conveyed those 4 points to your interviewer, that's more than enough to demonstrate your understanding of health policy. I can't really imagine going into further depth on this topic in an interview, especially if your background is not in health policy. Your interview should focus on your interests, whatever they may be, after all.