Answers for "how to update a project unity"

Is It Safe to Upgrade Your Project From Unity 2019 to 2020?

According to those who have done it (Including myself), yes it is safe to do so.

what does update() do unity

// The Update() function runs once per frame
// It's used to run a code every frame of the game

void Update() {
	//Any code you put here will run every frame of the game
}