Good and bad practices in the making of a web page

According to a study by Microsoft, the first ten seconds are critical to the decision to stay on a page or not. It is therefore necessary that the reader is held by the appearance of the page, its introduction: communicate your value proposition within 10 seconds.
Because they are often disappointed by what they have seen before. But when they remain 30 seconds on the page, there is a good chance that they read in its entirety. To pass the milestone of 10 and 30 seconds, a Web page must be designed in a certain way, not just for the design, but for all that it contains.

Here is what to do and what to avoid in the design of pages for users, but also for search engines.

What to do

What to avoid

See also : Designing a home page and quality of a web site.