How Bad is it?
Kids: These are just used by kids. Don't use these unless you are five.
Super polite: Many of these are euphemisms--expressions we use when we feel too uncomfortable or embarrassed to say the real word. Even ministers can use these. Be careful though--if you use these in a casual situation with friends, they might think you're a little too polite.
Okay: These are words most people would say to their friends, but maybe not to their grandmother or teacher.
A little bad: These words may be acceptable with friends, but some people think they are rude. You can hear these words on broadcast TV.
Bad: Many people think these words are impolite. Unlike the words which are "a little bad", you will not hear these on broadcast TV, but you can hear some of th on cable TV or in movies.