Why Does My Garage Door Shake When It Opens?
A garage door should move in a controlled way. Shaking, jerking, or uneven movement can point to a problem with the door or its hardware.
By Everyday Home Advice Editorial Team

A garage door should move in a controlled way. Shaking, jerking, or uneven movement can point to a problem with the door or its hardware.
Watch from a safe distance
Look for obvious uneven movement, roller problems, track movement, and loose visible hardware. Don't place hands near moving components.
Is the door balanced?
Balance problems can put additional strain on the opener. Testing or adjusting spring systems can be dangerous and should be handled appropriately.
Don't keep cycling a badly moving door
Repeated operation can worsen some mechanical problems. Find Local Garage Door Help