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 realized that if I don't wanna hug the person, it means I dislike them. Even if I can't say why, but that's the fact. Sooner or later, we would have a conflict and eventually break up.

11. Invest all money into your startups and friends.
Not crypt0, not stockmarket, not properties.
I did some math, if I kept investing all my money into all my friends’ startups, that would be about 70 investments.
3 of them turned into unicorns eventually. Since 2022, I have invested all my money into my products, friends, and network.

12. Post on Twitter daily.
I started posting here in March this year. It's my primary source of new connections and traffic.

13. Don't work/partner with corporates.
Corporations always seem like an amazing opportunity. They're big and rich, they promise huge stuff, millions of users, etc. But every single time none of this happens. Because you talk to a regular employees there. They waste your time, destroy focus, shift priorities.

14. Don't get ever distracted by hype, e.g. crypt0.
I lost 1.5 years of my life this way.
I met the worst people along the way. Fricks, scammers, thieves. Some of my close friends turned into thieves along the way, just because it was so common in that space.

15. Don't build consumer apps. Only b2b.
Consumer apps are so hard, like a lottery. It's just 0.00001% who make it big. The rest don't.
Even if I got many users, then there is a monetization challenge.

16. Don't hold on bad project for too long, max 1 year.
Some projects just don't work. In most cases, it's either the idea that's so wrong that you can't even pivot it or it's a team that is good one by one but can't make it as a team.

17. Tech conferences are a waste of time.
They cost money, take energy, and time and you never really meet anyone there. Most people there are the "good" employees of corporations who were sent there as a perk for being loyal to the corporation.

18. Scrum is a Scam.
If I had a team that had to be nagged every morning with questions as if they were children in kindergarten, then things would eventually fail.
The only good stuff I managed to do happened with people who were grownups and could manage their stuff. We would just do everything over chat as a sync on goals and plans.

19. Outsource nothing at all until PMF.
In a startup, almost everything needs to be done in a slightly different way, more creative, and more integrated into the vision. When outsourcing, the external members get no love and no case for the product. It's just yet another assignment in their boring job.

20. Bootstrap.
I spent way too much time raising money. I raised more than 10 times, preseed, seed, and series A. But each time it was a 3-9 month project, meetings every week, and lots of destruction. I could afford to bootstrap, but I still went the VC-funded way, I don't know why. To be honest, I didn't know bootstrapping was a thing I could do or anyone does.

That's it.