You want your website must be organic search engine optimization but is long term and complex process. You can using some of tools your work is easier, very fast. when you start your work but you need imporvement report. you must be using some of free and paid tools.
Best SEO Tools and Resources
1. Yoast SEO: https://wordpress.org/plugins/wordpress-seo/
2. All in One SEO Pack: https://wordpress.org/plugins/all-in-one-seo-pack/
3. Google Keyword Planner: https://adwords.google.com/home/tools/keyword-planner
4. SEMRUSH: https://www.semrush.com/
5. AHREFS: https://ahrefs.com/
6. Uber Suggest: https://ubersuggest.io/
7. BUZZUMO: http://buzzsumo.com/
8. LONGTAIL PRO: https://longtailpro.com/
9. SEOQUAKE: https://www.seoquake.com
10. Soovle: http://www.soovle.com