Exposure to the writing of native speakers is the best way, really. Consider copying writing you admire word for word. Pay attention to how the author words each sentence.

If you practice writing English without help, you will make errors. If you make the same error many times, your brain will begin to think it's correct. Then it becomes cemented into your head, and you'll continue to make that error for a long time.

So do not practice writing English alone. Instead, read, and you will naturally absorb good grammar.

And please! Remember, no space between the word and the punctuation!

Incorrect: "Yes , i read lot of articles and stories on medium .but , can you suggest me some method..."

Correct: "Yes, I read a lot of articles and stories on Medium. But can you suggest a method..."

Read, read, read! Copy, copy, copy! And listen, listen listen. It's the best way to learn. But make sure you're reading and listening to native speakers - people from the US, the UK, Australia, New Zealand, etc. Don't learn mistakes from othe people who speak English as a second language.

Now, can you teach me one phrase in your language?