While generally easy to install, without an Introduction or Basic Principles of Operation as a preamble, you will likely have the same issues I did. Read on for the lessons I learned and tips that will save your hair. I will explain each of the major elements of the system and provide suggestions to improve your probability of a successful installation.
Your dream car is parked in out of the elements, but it's not secure because the garage door won't lock. Most garage doors have two horizontal bars that move out from the center of the door into slots along the side of the door in the door track, effectively locking the door in place. Over time, these bars can shift slightly out of position so that they are no longer correctly aligned with the locking slots. To realign the bars, unscrew the guide brackets on the edges of the door so that they are loose enough to move, and then reposition them so that they smoothly guide the locking bars into the locking slots. Lubricate the lock mechanism with machine oil and you're done.
The tech that serviced your door must not understand simple mechanics. The tracks do not move, so they do not need to be lubricated. All that does is make a mess. The rollers and hinges DO move, so it is logical to lubricate them, at the hinge barrel or pivot point, and in the little area near the stem of the rollers where you can see the bearings. Adding a bit of lube to the torsion spring also cuts down on the friction between the coils and makes the spring glide easier. However, too much will make it spritz out lube as the door opens and closes, and that it less than desirable. Same thing for pulleys on an extension spring door.