Making your website content search engine friendly is absolutely crucial to your SEO campaign. Whether you think so or not. What marketers mean by making your website content search engine friendly is:
1) Target Keyword(s) in the alt tags of your images.
2) creating content that is neither duplicate or stuffed with keywords (stuffing your website with too many keywords is also bad for your SEO as it makes it worse due to this also being a spammers way of doing things)
3) Adding enough keywords for the amount of text used is crucial.
Picking the right keywords or long tail keywords to get the maximum effect. (long tail keywords are a string of words best described as a certain phrase people are most likely going to use in a search to find you or your services)
4) Make sure your site title contains the keyword(s), double check your meta-description contains the keyword(s) also and is no more than 156 characters long. Any longer and again it will effect your SEO campaign.
6) To get the effect of all of the above it is often a good idea to PING your website to let search engines know you have made some changes quicker than their crawling times. What is a PING? It is usually found on websites that will send a little piece of code to a search engine to notify it of any changes, the search engine received this code and then will crawl your website to index any changes within the next few days.