SEO is Search Engine Optimization or just how easy it is for Google to find your website. Now there are other search engines out there like Bing, Yahoo, DuckDuckGo, and Yandex. Since 90% of searches are on Google we will focus on them.
Basically search engines go out and crawl the web to find pages and index them in there catalog. It's similar to a index in a book and how it has chapters and pages related to the content of it.
Typically there is about 10 organic results on a search page. Organic results simply means that the results aren't paid ads. They show up on the search engines because they have done a good job at telling the search engines that this page is related to the query.
Fewer than 10% will click on the next page. If the searcher cant find what they are looking for on the first page they simply adjust the search query.
The reason why seo is really important is the first three organic results receive 70% of all clicks.
But how does a search engine determine what will go on the the first page? the biggest factor is relevancy. You want to make sure that your website is exactly what the searcher is looking for.
Along with relevance, you also want to make sure that your website is useful. All that means is that the information the searcher is looking for is easily found.
There are two main ways you can work with SEO on your website. That is
On-Page SEO is telling Google and the reader that you have everything that they are looking for. On-Page SEO is easier to deal with because most of the changes needed are in your control. Like updating textual information to include keywords related to the search queries. Keywords can include supportive terms related to the topic. For instance a bakery will have supportives like recipes, oven temps, and types of flour.
Off-Page SEO means other websites are linking back to your website. Now that can be kinda hard because they have to make sure that your website is worthy enough to be linked.