You hit the green, grab the putter and start looking at the line. There is one more thing to look for first: the mark your approach left behind. For New York City golfers sharing busy public courses, repairing a ball mark is a small courtesy with a real effect on the next group's round. The important part is not owning a fancy tool. It is moving the turf the right way.
Push inward, not upward
The USGA Green Section's instructions are straightforward. Insert your repair tool behind the ball mark and gently push the top of the tool toward the center. Work around the indentation, pushing the surrounding turf inward. Once the turf is back in place, gently tamp it down with the putter to leave a smooth, firm surface.
The common mistake is treating the tool like a little crowbar. Lifting or twisting can damage the roots. A mark that looks flatter is not necessarily repaired well if the grass beneath it has been pulled apart. Think about bringing the edges together rather than hauling the bottom of the dent upward.
A tee can do the job
You do not need a particular brand or an elaborate mechanism. The USGA says almost any pointed tool, including a golf tee, can repair a ball mark effectively. Single-prong and fork-shaped tools are both options. Technique matters more than the shape of the gadget.
That makes preparation simple: keep a suitable tool or tee where you can reach it before walking onto the green. Searching the bottom of the bag after every approach is an avoidable distraction. Having it in your pocket makes the repair part of arriving at the green, rather than a separate chore you remember after the group has moved on.
Soft greens deserve another look
According to the USGA, wet or soft greens have more problems with ball marks. Greens receiving high, lofted approaches are also more susceptible; par-3 greens are an obvious example. When those conditions apply, look for your mark rather than assuming the ball did not leave one.
There is a reason this is more than a question of manners. Unrepaired marks can take weeks to heal and can send a rolling ball off line. The damaged surface can also give weeds an entry point. Repairing your own mark and a couple of nearby marks is a useful way to help the course without waiting for someone else to notice the problem.
What the rules let you repair
Ball marks are not the only damage you may repair on the putting green. The USGA's explanation of Rule 13.1c(2) includes shoe damage, indentations from a club or flagstick, and animal damage. The purpose is restoring damage, not redesigning your route to the hole.
Do not confuse damage with every irregularity you dislike. Aeration holes, natural surface imperfections and natural wear of the hole are excluded from this permission. Repairs also must not unreasonably delay play. A quick, careful repair is the idea, not a lengthy renovation while the rest of the group waits.
Make it part of the routine
Look for the mark, work gently around it, push the turf inward and finish with a light tamp. If another obvious mark is nearby, help with that too, without holding up play. It is a modest habit, but it leaves the next player a better surface than an unrepaired dent would. On a shared course, that is a good return for a little attention.
Sources: USGA Green Section: Repairing Ball Marks; USGA: Repairing Damage on the Putting Green.
