A city is larger than a town. New York City, Boston, Miami, and Los Angeles are examples of cities. All state or country capitals are cities; cities usually have some significant political, economic or cultural importance. The word town refers to a smaller population center. And a very small population center - even smaller than a town - is called a village.
To complicate things, the central part of a city (especially the main commercial or business area) is called downtown. If you live downtown, you live right in the middle of the main action of the city - and it's more expensive to live downtown than to live in one of the other neighborhoods.
Similar to the Rubber Band Method is the Five Rings Method, which has you start the day with five rings on one arm. Every time you yell during the day you take off a ring. By drawing your attention to how many times you yell, you will learn to yell less.