If only someone told me this before my first startup

1. Validate idea first. I wasted at least 5 years building stuff nobody needed. 2. Kill your EGO. It's not about me, but the user. I must want what the user wants, not what I want. 3. Don't chaise investors, chase users, and then investors will be chasing you. 4. Never hire managers. Only hire doers until PMF. 5. Landing page is the least important thing in a startup. 6. Hire only fullstack devs. There is nothing less productive in this world than a team of developers. 7. Chase global market from day 1. You'll win or fail despite the market you target in most cases, so go for bigger upside. 8. Do SEO from day 2. As early as you can. I ignored this for 14 years. It's my biggest regret. 9. Sell features, before building them. Ask existing users if they want this feature. I run DMs with 10-20 users every day, where I chat about all my ideas and features I wanna add. 10. Hire only people you would wanna hug. My mentor said this to me in 2015. And it was a big shift. I r