If you're an SEO beginner then Google products might be the best choice for you. Basically, you need two tools for getting started with SEO.
- Google Search Console: It will enable you to control/customize your search appearance.
- Google analytics: It will enable you to keep track visitor's behavior which will further help you to modify changes to your site according to traffic's behavior.
The thing I love about Google products is they are free, well-documented and they have an amazing culture of listening to feedbacks.
Tip: Use the Yoast SEO Plugin to improve your SEO experience on WordPress.