Only SEO specialists or those who have experience in SEO needed.
The topics should be about the lastest trends in SEO, the insightful and valuable discussions on SEO, the technical aspects of SEO.
Generic and basic topics are not acceptable.
You can choose any topic you like or you are good at, as long as it is about SEO.
We do have keywords for the articles, (seo services; sem services), but you are not limited within the given keywords, as long as the keyword is used contextually in one sentence, it is fine.
No keyword density required, once is fine, as long as natural.
Long term cooperation will be maintained with those who are SEO specialists.