Method 1 and method 4 is exactly the same thing, only the switch is swapped around. Likewise with Method 2 Method 5 and Method 6 is exactly the same thing. Method 3 is something else
and if we will try it for two way connection from two different places it will operate only one off and one on but the same time if we will off the both switch it on the bulb will remain glow so where is two way connection in all the 6 types of wiring