SEO stands for search engine optimization. SEO is a collection of steps you take to help your website appear higher in search results. The most important part is having in-depth content on your website about your products and services. On your website, you need to answer all the questions you receive from customers. You should give the positives and negatives.
Other factors that strongly contribute to good SEO:
Does your website reformat to fit correctly on a mobile phone (this is called responsive design)?
Do you have reviews for your business on Google and Facebook?
Is an SSL certificate installed on your website?
Do your website pages load fast for slow internet connections?