Just Search
SEO is an industry with many varying levels of knowledge. Some websites need very little work to rank well, and little knowledge to help them along. other websites need more of an expert eye casting over them to see what the problem is.
If you have a website and you need to optimise and take on some internet marketing then the internet can be a great way to learn the basics. There are many many websites out there that will teach you SEO and if you just Search for help there will be plenty available. I have found in my day-to-day work that a lot of people are now doing this.