It can be difficult to determine the criteria for a SEO agency. This is because you may not understand the SEO process. A majority of SEO clients would expect a professional SEO agency to rank at the top for all relevant key terms. Although it seems very logical, this doesn't necessarily reflect on other agencies. There are thousands and thousands of SEO companies. It's not possible for all agencies to be on the top page with only a small number of positions. When you begin to look at the most successful SEO agencies you can start to see why they are there, and what you should do about them. There are many ways to inspect an SEO Service. However, I would recommend the following:
You can search their company name
When you search their company name, you'll see their article submissions, directory listings and social media pages. If the company is large, however, there may be some feedback. It is likely that someone will share their experience with an SEO company on a blog or webmaster forum. This is because many SEO companies are unethical and promote their services with these reviews.
Look at their portfolio
You will find a lot of testimonials from SEO agencies that are good at what they do. Do not be afraid to ask for examples of previous work. If an SEO company has a large number of clients and only a small amount of testimonials, they should explain this to you or ask the owners of these sites. Webmasters will tell you more about what isn’t working than what is working.