Always proofread a final time. Before submitting or uploading the article, go over it one final time with a fine tooth comb. Read each paragraph out loud, and listen to how it sounds. Examine each word for spelling, each sentence for structure, each paragraph for thought. Such questions and careful consideration will go a long way toward filtering out the incompetent offerings we sometimes see on the internet.
Writing requires discipline.
It is a most rewarding activity, and can be very beneficial not only to the reader, but also to the writer.