If I say The 1980s Popular Cluture, and I am referring to the whole decade, do I need an apostrophe? What's the difference between 1980s, 1980's, 1980s', 80s, 80's? Which do I use and when? please help!

When do you use the word between and when do you use the words in-between? Is there a dash? If I am referring to a street that is between two other streets (I will use the letter "H" as a visual example of the streets), do I use between or