seo – All the necessary information before publishing a website

After coding your website, what are the final steps before making the website LIVE, such as code optimization, minification, linking to the Google console, adding CDN ..?
What should you add to improve SEO (I know the meta description, keywords)?
What could you do to improve the performance of the page?
And maybe there are other things you should configure before making the website LIVE?

Sorry if the question is not perfectly understandable, I do not know how to correctly put all the information. What I want to know is what steps do you need to follow to make sure your website is ready to be used LIVE?