i mark my balls with 2 stripes is that bad for the ball?
oops does puting marker on your ball to mark it… was what that was suposed to say

Of course not.
For one you should mark your golf ball so you can identify it as clearly being yours in certain situations.
Second, you can line up one of those stripes with the line of your putt as an alignment tool. Most pros’s do it. Most amateurs don’t.