What is the best way that people can learn about the rights guaranteed to them by their government?

I went to law school. That’s very expensive though…

I was wondering what internet sites, local groups, organizations, meetings, classes, etc. people had found that taught them about a right they wanted to learn about – or even better, something that taught them about a right they didn’t know they had.

If you have an example, please make sure to say what country your from if possible – I’m from the U.S., so that’s my personal interests – but there is value in comparing what rights people have (or do not have) in other countries.