Bike Forums

Hey there guys. Uhh, my name's Josue and I'm from Mid-City Los Angeles. I decided to sign up for this site 'cuz I have a ton of questions that I would like answered, haha. I'm new to cycling; I got a used mountain bike (Free Spirit Comfort DX) for free as a graduation present and I don't know anything about it, except that it was made in Canada. Hooray.
Also, a few of my friends ride and I ride with them, but they all have road bikes and talk about "frame sizes" and "fixies" and other stuff that I have no idea what it means. They also tell me to get a road bike to keep up, but those look expensive, so I don't know.
Uhm, that's about it, I hope you guys can help me familiarize myself with the in's and out's of cycling.
Well I gotta head out to work, so I'll be back in the evening to see how all of this goes.
Thanks!