Why do you think we dedicated an entire chapter to this topic? It is because on-page optimization is vital.
If you’ve applied on-page optimization to your site, then your website is crawler-friendly. Crawling helps Google find and index new information. There are various tools you can use to help you do this. One example is HubSpot’s Website Grader. Other options can take on most of the SEO work for you; take WordPress plugin RankMath for example. Once you have covered most of the on-page SEO elements, proceed to the next step.