If we talk about SEO, indexing is about search engines to add or to list your site's links on their SERP (not SEPR). SERP consists of Search Engine Result Page. If you have no idea how to get better rank on Google, you may ask for help from SEO specialist. All SEO learners know offpage SEO, onpage SEO, linkbuilding, etc. But, without some combination of creative SEO strategies, the competition will never end. Shortly, the strategy is how to make zero competition, and get your keywords rank on the top of the SERP.