Regular maintenance on a garage door should be done 3-4 times per year, ideally. If you only do it once a year, you will still be doing better that most people, because most people never do it at all.
Then when we come out for service we see doors that are nearly stuck in place for lack of lubrication. A little grease can save alot of service fees so we recommend that our customers perform their own regular maintenance whenever possible.
It can be a dirty job, for sure, so if you are going to do it, put on some clothes that you don’t mind getting black grease stains on. A step stool may be helpful for the height challenged.
Spray grease in all the hinges and all the rollers of the door. Also spray grease on the opener rail. This will be different depending on the type of opener you have.