What are the most important points for writing quality SEO content?

You basically must understand the way Search engines function, be completely aware of all the developments / updates on the way search engines crawl. The thumb rule is to put yourself in the shoes of the reader, produce the kind of content he/she would actually read.

 

Yes. Your point is correct. There are two kinds of SEO keywords basically. Short and long keywords. Over usage of SEO keyword may take your article for deletion. 3-4% is ideal for a 1000 word article. Content should be very superior, informative and highly interesting to read. There are other articles that do not carry any SEO keyword but still top in search engines. The reason being, quality. SEO is mostly ideal for marketing, advertising and to increase traffic of a website. Particularly when there is stiff competition online, there is a need to choose low demand keywords.

 

I can't really get the reason to use this... Is there any difference for SEO if we use 4 words in the sentence or 8 words for example? For me longer ones are better so in the search engines people could read the WHOLE or at least the bigger part of the sentence around the keyword!

 

I suggest you should take care of following things while preparing SEO contents.

1> The content must relevant to your business and offers unique information and knowledge about your products and services.
2> The headings of the contents must be so attractive.
3> The keyword density must be 1-2% of your whole article.
4> If you are creating SEO content then you should never use all keywords together.
5> You should add maximum possible tags relates to your article.
6> The most important thing is the content must not be 1% copy even.

Thanks