The things that are in your control are: if you have a cable internet connection and not fiber, get a fiber connection. This will shave around 30-50ms ping. Second use a ethernet connection from your pc to the router. Use wifi only if you play on a laptop or if it is hard for you to get ethernet cable to your computer.
What’s a good ping? An acceptable ping is around the 40ms-60ms mark or lower. A speed of over 100ms shows a noticeable delay and over 170 some games will reject your connection entirely. If you have, say a 10ms ping (0.01 seconds), your gameplay will seem faster and smoother than playing with 100ms, for example.
The ping from your pc to modem increases the amount of ping you’ll have when connecting to a server elsewhere. Even LAN games have some degree of ping/latency. Ideally the lower the ping/latency the better. In FPS < 70 ping is ideal.