To print to the console we use the unity Debug class as shown below.
Debug.Log("This is a simple log.");
Debug.LogAssert("This is an assert...");
Debug.LogError("This is an error...");
Debug.LogException("This is an exception...");
Debug.LogWarning("This is a warning...");
When using the System namespace its Debug class might do some weird stuff.
You can use
or simply add
using Debug = UnityEngine.Debug;
at the top of your class after the imports.