flex tape.
Seriously though, I guess it depends on the damage?
If you've got top layers of your nail plate flaking off, but the nail is otherwise structurally sound, I would clip anything that would snag day to day, and let the nail get as much air as possible. Use jojoba or argan oil on your cuticle area to help strengthen the nail as it grows out, but avoid damaged areas. I had a stick on nail phase that fucked with my nails, but doing the above helped tremendously.
If you have more structural cracks or something like that, get that assessed by a manicurist. Had a friend who slammed her manicure in a car door once. The next day she visited a salon and they helped "patch" the natural nail for her