how to ping pong:
1. Recognise a lane that you can play through
2. Don't show yourself on the wave. Go through the river and make sure you clear their vision.
3. Ping your laners to push and make sure that your around in case enemy ganks.
4. Once the wave is secured and their fine start pingponging.
Pingpong conditions
1. After your jungler took his camps, this way he can play in enemy jungle and camps are respawning and incase he dies its alright.
2. Right before objectives.
3. If you want to free up a losing lane and rotate together to look for invade/dive/setup