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.
How's your experience using flutter web? I love flutter and dart used it for a few mobile apps. Tried using Flutter Web and felt like it was missing a lot to make it usable in production.
FullStack developer focusing on building backend APIs and SPA/PWA front ends. Currently a lead developer at venuegenie.com with plenty of startup and agency experience. Even if the position doesn't hit one of my strengths don't be afraid to reach out I'm always open to learning something new.