To repair and maintain the holes and damage in a PVC garden hose, you can follow these steps:
Turn off the water supply and release any pressure in the hose by opening the nozzle.

Locate the hole or damage in the hose. If it is a small hole, you can use a PVC patch kit that is available at hardware stores. If the damage is larger, you may need to cut out the damaged section of the hose and use a coupling to join the two pieces back together.

If using a PVC patch kit, clean the area around the hole with a damp cloth and dry it completely. Apply the adhesive according to the instructions on the patch kit, and cover the hole with the patch. Hold the patch in place for several minutes to ensure a strong bond.

If cutting out a damaged section, use a sharp knife or a PVC cutter to make clean cuts on either side of the damaged section. Insert the coupling into one end of the cut hose, and attach the other end to the other side of the coupling. Tighten the clamps on both sides of the coupling to secure the hose in place.

Once the repair is complete, turn the water supply back on and check for leaks. If there are no leaks, your hose should be ready for use.

To maintain your PVC garden hose, here are some tips:
Store your hose properly. When not in use, coil the hose neatly and store it in a cool, dry place. Avoid leaving it in direct sunlight or near a heat source.

Avoid kinks and twists. Kinking or twisting the hose can cause it to weaken or even burst. Use a hose reel or a hanger to keep your hose straight when not in use.

Keep it clean. Regularly rinse your hose with clean water to remove dirt and debris. This will help prevent blockages and prolong the life of your hose.

Avoid dragging the hose over sharp or abrasive surfaces. This can cause abrasion and damage to the hose.

Check for leaks or damage regularly. Inspect your hose for leaks or damage before and after each use. Repair any holes or damage as soon as possible to prevent further damage.