Most people never takings the period to do enough research earlier creating their keywords. So they rarely target keywords that are either overly competitive or not hunt for enough. This can be a large mistake and often terminal in failure when it comes to ranking in Google for applicable terms.
Well, Keyword Research and Selection is one of most responsible feature of SEO because of the selected keywords are used in Meta and Content. We always use right and relevant keywords with low and medium competition for the website.