I happened to meet a strange guy. He told me about bitcoin, about how this coin will grow in price. He wanted to sell me pseudo-money for $ 2,000. I told him to fuck off. And in December 2017, I very much regretted that act. In those 6 years, I changed business twice because of the recession. And cryptocurrency is taking over the world. I learned a very important lesson from that case - always say Yes to new opportunities. Doubts ruin the future!