Unity C# - How to restart a level when a character falls into an abyss?

Question

2D

Hello. I am a beginner learning Unity 3D writing in C#. I'm experimenting with one game. Now faced with the problem of how to restart the level (SceneManager.LoadScene(SceneManager.GetActiveScene().name)) when the main character falls into the abyss? Thank you in advance
PS How to restart the level, I understand, you need to check whether the character falls into the abyss or not ? And then reload the level.