Here is an excellent article (not mine) on booking stopovers. If you are a simple “Point A to Point B” kinda guy/gal, you have no idea what you’re missing!
Everyone in this game knows how to earn points- it’s pretty easy. But for some reason, few people take the time to learn how to use their miles well. Whenever I hear of trips people have booked as multiple tickets I think about how I would have booked it as one. My favorite “trick”, if you will, is simply adding stopovers. Adding stopovers means seeing more places, for as long as you want, at no extra cost. Heck, sometimes adding stopovers to your route can actually save you miles!
Read more at: A Quick Guide to Booking Stopovers | Frugal Travel Guy