How do you avoid mistakes while writing?

I usally revise my posts before I post them , if you are suspecting that you made spell or grammmer mistake you can use Microsft word ,  if not just revise them . 

If you are writting a book or something important you can ask an expert in language to review it for you .

1. by carefully revising them before submitting 

2. consult the Internet, or other experts in that matter  ( expert jugdment )

3.  if you felt that you have a paraghaph you are not sure of I suggest to remove it in odre not to lose the credability and the core message of the whole blog 

What kind of mistakes?

I use profeesional programs of editing and checking spelling or grammar.Sometimes,I use rephrasing sites too.