A garage door that squeals, grinds or shudders on its way up is almost never broken. Nine times out of ten it just needs lubricating - and doing it properly takes about ten minutes twice a year.
Start by closing the door and unplugging the opener so nothing moves while your hands are near the hardware. Wipe the tracks clean with a dry cloth - tracks guide the rollers, they are not meant to be greased, and lubricant inside them just collects grit.
Then spray the moving metal parts: the hinges where the panels fold, the rollers (aim for the small bearings, not the nylon wheel), the springs across the top, the bearing plates at each end of the spring bar, the lock and the armbar. Open and close the door twice to work the lubricant in, then wipe away anything that drips.
What not to use: WD-40 is the most common mistake. It is a solvent and water displacer, not a long-term lubricant - it strips the grease that is already in the bearings and leaves the door noisier within weeks. Skip heavy automotive grease too, which thickens in cold weather and traps dust.
A silicone-based garage door lubricant is the right choice. Silicone stays slippery across a wide temperature range, will not gum up in winter, and does not attract the dirt that makes grease-based products fail. Apply it in spring and again in autumn, and most doors will run quietly for years.
One note on safety: never spray or adjust the torsion springs beyond a light coating. They are under extreme tension and any repair or tensioning work belongs to a professional.