I was helped by Google Translate to write in English. I think currently Google Translate has good translation capabilities and I'm sure other members can understand the meaning of my writing

Talking about the quality of your posts is not what tool you use, but rather your own abilities as the account owner. The best way to improve the quality of posts is to increase your knowledge, so read a lot... There are lots of cheap books out there, and now there are also lots of free PDFs that you can download.