The best way to get better at writing, IMHO, is to do more reading. While there are a lot of great posts and posters here on SDMB, and a higher level of writing than a lot of other places on the internet, I would still recommend book reading to improve your understanding of how English works. In this case, more is better. Find a writer you like and read.
You also seem to have trouble using spaces where they need to go.
The first thing you need to do is start applying the rules you know and understand consistently. If you can’t do that then there’s little point in trying to learn more.
More power to you, Sweat209. There’s always room for improvement, certainly, but the fact that you post pretty prolifically in your non-native tongue is impressive. The best way to learn how to write is indeed by reading…but not just any random text…you would do well by reading respectable English language journalism and perhaps some good fiction.