I'm 16 and my goal is to become an Indie Hacker before I'm 25. Right now I'm only learning HTML and CSS because I want to build a solid foundation before moving on. If you could go back to when you first started, what would be the ONE skill you wish you had learned earlier? I'm not looking for motivation or "just build." I'm looking for practical advice from people who have actually built products or make money as Indie Hackers. What would your roadmap look like if you had to s...