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These cables run through the springs and will hold the door in case the springs break. That is why you have to ensure that they are properly attached and that they are in good condition. They should not be rusty, deformed frayed, worn out or loose. In such cases, immediate replacement is required.
For lubrication maintenance, most of the moving parts can be sprayed with lithium or silicon. However, plastic-made parts, if there are any, should not be lubricated. Lubrication on these parts, such as the plastic garage door rollers and bearings, is not going to yield any benefit and may only damage the plastic material.