I’ve been struggling with the right usage of “to” and “too” lately (probably since I write in english). totoo.com explains the right usage of the two words very easy. I hope that I’ll be able to use those words in a correct way.
I had similar problems with the words “loose” and “lose”. The site looseorlose.com helped me with this as well.
Luckily I never had any issues to see the difference between “your” and “you’re”. This site contains a fun scene from the TV show FRIENDS to explain the difference between the two words.