During the past experience of Ludum Dare, one thing keeps confusing me is how to communicate between game objects "elegantly" in Unity. Since I am not a full time professional game dev, I really like to know what are the widely used proper way to handle this.

Several methods I've used before:

1. Tight coupling referencing (either using Find, GetComponent, or drag and drop in Editor)
2. Delegate (never used during a jam though as everything is build up quickly)
3. Having a GameManager handle most logic, while entities mainly contains data only and have a reference to that global GameManager

Would like to hear your thoughts