The two universal currencies out there (that I use) for reward points are American Express Membership Reward Points and Chase Ultimate Reward Points. More about the two can be found on many sites.
You have to learn about the hotel, airline, credit card cliques. We have two main players: American Express and, J.P. Morgan Chase. Some of the big partners with American Express are SPG, ANA, Delta and British airways. On the other side Chase has relations with Marriott, Ritz Carlton, and United airlines. So it may appear that you have to be loyal to one point system vs the other. This is not the case. For example If you wanted to fly on united from Tokyo to Guam, you have the option of booking a flight through ANA Milage Club using American express points: