On a website/server/architecture level, how do you make your site crawlable, renderable, and indexable by search engines.
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Our site begins as a URL, it gets crawled, rendered and indexed. And at some point, it needs to be retrieved as soon as our site answers the query of some kind of searcher.
If Google is not able to find all the pages on your site, render them correctly, understand what they're about, and index them properly, you're never going to get served, ranked, or end up with a click.
Note 1: Google follows actual links, but it does not interact with your page. It means that content accessible via infinite scroll or search input only won't be crawled.