This is not a training manual or course work of how to start your writing or proofreading career, though may be helpful up to some extent to new content editors and authors.
Here I am supposing that you are someone who has written your own content after struggling with research, your article is ready to publish, but before you click publish or submit it to your employer, check and recheck for errors. Here is how to?
As a first step look which paragraphs are longer than usual (this is a bit of styling part), break it into two or more. If required add or delete few lines or words.
Check facts and figures, it’s important, sometime in flow of writing, words keep coming and unusual stuff ads, watch for these. For example your writing is about radioactivity (this is a portion in college physics), since Curie fascinates you, there appearing so many phrases about her life. Mind it your writing is about Radioactivity and not about its …