If you want to make sure your website is checking the right boxes when it comes to Google’s guidelines on SEO and Page Speed try checking out some of the helpful tools from Varvy – https://varvy.com/
It’s a really helpful indicator to see if you might need to make any improvements to your site.
If you can follow the guidelines as best you can then you’re giving your website the best chance to perform well, when used alongside good development principles, and thoughtful SEO and content marketing strategies.