Kostiantyn, a 14-year-old fullstack developer, has earned over $3,000 by working on real projects and freelancing.He is mastering JavaScript/TypeScript and Next.js for frontend and backend development, focusing on building simple SaaS projects.Kostiantyn decided to put learning Go on hold as it doesn't align with his current goals of earning money faster and building complete products.His goal is to continue building SaaS products, improve his skills, and eventually explore other backend languages like Go or Rust in the future.