No matter how much money you spend on your website, just one grammar or spelling mistake will damage your credibility.
If your website contains poor quality content, Google will notice.
Matt Cutts, head of Google's webspam team, says that sloppily written websites rank less highly than those with well-written content. But actually, there's more to it than search engine rankings. Badly written websites are difficult to read. Your visitor will leave your site and search elsewhere.
Keyword Copywriting can proofread your website or blog and spot any errors in spelling, grammar and punctuation. I can also give you some pointers about on-page SEO.
Everyone makes mistakes, and I've been trained by the Society of Editors and Proofreaders (SfEP) to spot them.