happiness and Buddhism

Hi!:)
I have always been interested in Buddhism, since school days when I studied it for two years. I think it has wonderful principles, and I like the fact you dont have to worship a God as such.

When I was suffering from depression last year, I read The Buddhist Teachings, and it made me feel better.

Do you think that Buddhism makes and/or keeps you happy?

and why?

Which principles do you think people who tend to get depressed could benefit from following?

I know that there is emphasis on following the Middle Path. I guess, this is good advice for all out there, especially pessimists??!

Please tell me any advice on having an optimistic mind with Buddhism!!:)
have a great day!!:D