How write own program

Answer 1

You can do so here in the code playground, or you can use a text editor/IDE (like @Eduard Arias said), but you will have to download Python on your computer (and the IDE, if you are using one).

If you just want to use a text editor, I would recommend Notepad++. If you want to use an IDE, I recommend PyCharm, though you should experiment with what you want.

Answer 2

I suggest to open some text editor and write some code on it :D