Many digital marketing agencies and educational institutions are offering certifications for SEO. To become a certified SEO writer or an expert, you need to do a course on one of the platforms that are offering these courses. You need to complete assessments and tasks related to SEO writing. You will also be tested on your knowledge of search engines and how they work. Many of these platforms have three major tests. You have to clear these tests with 60% to be a certified SEO professional. Once you get certified, you will get a lot of opportunities from a lot of websites.