A while back, a website was considered professional if it had flashy animation, a lot of graphics and sound animations, intro pages and so on. All of these may affect search engine crawlers when trying to read your content, links, tags, etc. The following article explains different methods which should be followed in order not to negatively affect search engine optimization.
Website Design for better Search-Engine Ranking explains how to properly create:
- Head Meta Tags: title, description, keywords meta tags
- Page Content: Images, same content