Whether English is your native or second language, we all make mistakes while writing.Improper grammar can change the meaning or clarity of the sentence.A lot of users use this to improve their written English.
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So there should be no hesitation in using a tool which helps you to correct your grammar mistakes.
If you are a blogger, you should especially look for grammatical errors in your content as Google gives preference to content that is well written.
Some common grammatical mistakes are with punctuation, sentence structure, spelling, subject/verb tense and other basic mechanics and parts of speech.
Simply write your content in any text editor or word processor that deems fit, and then copy paste it in the above given editor to check.
It shows all your Grammatical Errors, Punctuation Errors, Spelling Errors and in many common cases contextual errors too.