When is the time to use keyframes and when to use waypoints?

I don’t understand when is the time where you save a point in the timeline with a keyframe, and when waypoints do just fine in saving your place. Could someone please help me understand the proper use of these? Thank you! :slight_smile:

Please read this and if you continue without understand how does it work, please ask again:
synfig.org/wiki/Keyframe
-G