Google Chrome Browser
If you are starting your journey into the SEO world this would be my best initial advice. First, do yourself a favor and download Google Chrome Browser and install it on your computer. Google Chrome has great development tools that your will want to have on your side including AMP validation and website inspection tools.
Part of the reason that Google Chrome is so important is because of the ease of use that has been created by the development of a whole array of tools that support web development, design, SEO, AMP validation, among much more. As you keep on driving down this road you will how important is Chrome to you.