Downloading and installing Etcher 

Etcher will first format the microSD card, and then write the Raspbian Stretch image to it. Let's start by installing Etcher:

1. On your browser, go to http://www.etcher.io/.
2. Select your OS from the drop-down menu. Etcher will start downloading, as shown in the following screenshot:

1. Once it has downloaded, open the setup file and install Etcher.

Now that Etcher is set up, let's move on to Raspbian.