The springs extend along the shaft and work by twisting as the garage door closes by means of cables attached to each side of the lowest garage door panel.
Old style garage door side springs.
Side mounted springs are long heavy springs mounted on each side of the upper garage door track.
If you have one spring on each side of your door one of your springs breaks the spring on the other side will probably break soon.
If it was opening too quickly move it to the next lower hole.
As a result you may run into balance issues if you only replace one spring.
If you only replace the broken spring your old spring will be weaker as it will have lost some of its pull.
If the door was closing too quickly move the spring to the next higher hole on the bracket.
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Once the spring is free of tension remove from its track hanger.
Adjust the springs on both sides of the door the same way.