Why er write like this "class MyClass"

Question

why can't we simply write class myclass!

Answer 1

You can if you want... it's work ^^

But it's a useful convention for having a good readable code, where you can differenciate easily different type of variables.
Using the common convention allow to aquire the same reflexes than everybody, and avoid being confused by others writing style ;)

Answer 2

also capitalizing allows the ide to change the color of the class name to make finding instances of it easier when you make changes. just like indenting, it is there to make it easier to edit after you walk away for 6 months & come back to it