If you have built a program in any other language I would say rewrite that program in GO. The benefit being you already solved the the domain logic of the program the only thing you need to focus on is writing/learning GO.

If this is your first programming language or attempt to learn to program I would say to just pick a small but simple app/program and just go ahead and build it. Don't spend too much time on reading articles or video tutorials just get your hands dirty as soon as possible.