Committing mistakes in web design has become quite regular. These mistakes often lead to drastic results when it comes to search engine optimization. That’s because web design forms a very formidable part of SEO. Is there a dependable tutorial on some common mistakes in web design? Such a tutorial can do a world of good to the confidence of a budding marketer.
The internet is full of such tutorials and guides, just Google it 
http://socialmediatoday.com/endlessleadz/2017161/13-common-mistakes-web-design