Let's go ahead and install Atom. As long as you're running Linux, macOS, or Windows, you can go to https://atom.io/ and grab the installer. Run the installer and, if necessary, follow along with the prompts until Atom is installed. Now, start Atom and you'll be greeted by the welcome screen, which at the time of writing looks like the following:
Be sure to look at all the screens Atom has to offer. When you feel like you've explored enough, let's add a package to Atom that will complement our shell scripting. If you have the Welcome Guide screen still open, select Install a Package from there. Otherwise, ...