Where did you learn how to operate computer？

你在哪里学的电脑操作？

Where did you learn how to operate computer?

你在哪里学的电脑操作?

Where did you learn how to operate computer ?

你在哪里学的电脑操作？。

I am able to operate computer skillfully. I think this is very important for office work.

我精通计算机操作及办公软件的使用，这可以帮助我做好办公室。