use google search console and for your better understand you can follow some videos on youtube.
@clarasofia901: do you have any further questions?
For some reason, this thread is being seen by many as an invitation to Spam, and now has almost as many deleted posts as it has legitimate posts. Unless you have further questions, I think it’s time it was closed.
If you did all the OFF page SEO and still not ranking…Then you should check all your On page.You also check content and also asure that your site follow all the rule’s from algorithm.
Also check crawl status from webmaster may your site is not get crawl.This may also one reason for not to rank.