It is possible to write the Hindi language using the Latin alphabet, which are the letters on your current keyboard, so that's easy. If you choose to write in the Devanagari script, however, you would download the keyboard layout and choose it when you want to use it. Common Devanagari characters will match up with corresponding letters, when possible. There's an exception, as there are more characters than there are letters on your keyboard, so you'll use shortcuts for those. There are printable illustrations that show where each character would be, and you may want to print it to keep it handy on your desk.