When it comes to learning English writing, what’s most important? It is not about avoiding making mistakes because you can’t learn without making mistakes. It’s about avoiding getting trapped in the same mistake again and again.
You can only learn from a mistake when you realize that it is a mistake. You can only learn from a mistake after you admit you’ve made it. You can only learn from a mistake when you have courage to correct it.
Both smart people and stupid ones make mistakes. However, the former make new ones while the latter make new ones too, plus repeating the old ones. That is what makes the difference.