its a newbie question but what is ding’s ???
The word “ding” can have many meanings, but in terms of yoyos a ding is basically a small dent, surface damage. “Dings” would be plural, meaning more than one dent.
Actually, in yoyoing, the word ding originated from the sound you get whenever you hit a yoyo (especially a metal) against a hard surface. Try it! 
can it affect my yoyo’s performance?
No it won’t effect play.
Depending on how big is your ding. Most don’t.
i wouldny advise doing it on purpose though, most times that the yoyo gets a ding it looses value