Download the Android SDK
1.1 - Go to the Android Developer website, find the Android SDK Tools. Usually you can click on the "Installing the SDK" menu item, and choose "Stand-alone SDK Tools" instead of Android Studio. We don't need the Studio only the tools.
1.2 - Since the website links may change in the future, I won't post them here. Just choose the one which is appropriate for your machine. Don't worry, once that's done it gets easier. The images below may help find your way to the download links.