With over 8,000 properties in 139 countries, Marriott is one of the most popular hotel brands in the world. To get the most out of your Marriott stays, it’s worth joining the Marriott Bonvoy loyalty program. With five levels of elite status, Marriott Titanium elite sits near the top, just beneath Ambassador, the highest-level Bonvoy... Lee Huffman writes for NerdWallet.