This is a video that takes you through the optimal locations in which to place Research Stations for Pandemic. It basically takes this post and boils down the optimal placements for all iterations of Research Station availability from 2-6 stations. While this doesn’t cover all cases because the initial placement will determine which areas will get more attention, it’s a good starting point if you’re otherwise somewhat clueless about where to go.
Credit where credit is due. If you want to learn more about the analysis that went into deciding which points made for the best locations, I highly recommend checking out Joshua Snider’s website where he does just that.