will sort of take care of the cracks and the hole, but they will still be
visible. A section that is outright sunken indicates the site prep was
inadequate, and the dirt and gravel that is (hopefully) under the asphalt
has settled or washed away.
I'd patch what you can before winter, and start saving up for a new
driveway. When they get past a certain point, best to tear out down to
undisturbed soil, and start over. Walk around your neighborhood and look for
driveways that impress you, and ask who they used.
Depending on the size of the cracks, there are liquid fillers, caulking type
fillers, and small stone types in a bag (that you'd use on the hole too).
As for the sunken section, probably not much you can do DIY, especially if
it is a large section.
If it is old or very bad condition, it maybe about time to replace it. .
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