Read up on Google's current best practices for SEO.
Get techie if you want, reading Search Engine Journal.
Learn more in my Advanced SEO course.
Google Search might be the center of the SEO universe, but it's not the whole SEO universe.
Go further.
Depending on your site, and client, consider;
Understanding the Google Crawl Budget.
Search Engine Journal
Search Engine Journal
Google uses things like ETags, HTTP headers, and last modified dates to determine how often content should be crawled.