Garage Door Opener

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First you need to disconnect the opener from the door and manually open the door.

You should be able to open it 1/2 way and the door stay there. Open it 3/4 and it should continue up. Open it 1/4 and it should go back down.

If not the springs are broken and mis adjusted. That is not a DIY job.

After that you need to look at the opener.

You did not give a make and model number.

The older Liftmaster/Chamberlain/Sears using have a belt and pully drive. The the pully setscrew can come loose or belt broken.

Later ones have a plastic gear set that can wear out and strip the gears.

http://www.aaaremotes.com/gearsprocask.html