For those of you who don't know - and this may be obvious - here's a little tip on using tools:
Lefty loosey, righty tighty!
That means that whenever you're (un)screwing a bolt/nail into place, you can use the above golden rule to make sure you're (un)screwing it right every time! Turn your tool (wrench/screwdriver/..) to the left (counter-clockwise) and you will loosen the bolt, turn it to the right (clockwise) and you will tighten the bolt. I believe this applies everywhere! Feel free to correct me if not.
Happy tooling!