For those interested in global health or “money-balling” philanthropy — ie., trying to maximize how much good your dollar can do — you might like GiveWell and/or their recommendations for top charities. They are mostly focused on global health interventions that in expectation save lives, for example, bednets in malaria-infested areas, and suggest you can save a life in expectation for something like $5,000 (I haven’t checked recently as they update their models over time). GiveWell itself is essentially a research shop that looks into the most effective charities (by their lights/philosophy of what’s impactful) but you can also give directly to the charities they recommend, like Against Malaria Foundation, etc.
A related charity I have been following recently is the Lead Exposure Elimination Project (LEEP) which works on lead reduction. In the US, we all heard about lead levels in Flint, Michigan a couple of years ago, which were much too high, but many are surprised to learn how much worse the problem is globally, where lead poisoning accounts for something like 1% of the global health burden, and something like 1/3 children are exposed to dangerously high lead levels (which impacts things like impulse control and intelligence). Interventions are pretty tractable too — many governments just don’t have the tools to test for lead levels but once they do, they’re obviously incentivized to ban/remove such products (e.g. it’s still used in spices for coloring in some places).