There is a huge list of things you can do to optimise your website for search engine optimisation (SEO) - which is effectively 'things that help people find your website'.  Here are the top 9 that most people with a content management system (CMS) can do on their own to help enhance 'organic' (as opposed to paid) SEO:

1. Check for duplicate page titles - give each page a unique and descriptive name.
2. Meta Descriptions - ensure all pages have Meta descriptions and keywords.
3. Descriptive page titles - add a couple of keywords to each page title as well as your business name but keep it 64 characters or less.
4. Keyword density - some template systems automatically calculate the keyword density of a page for - what it means is the number of times a word appears on a page.  The goal is to increase the number of words that relate to your business and its services. This involves writing the content of your page in a way that mentions these words as many times as possible but still makes sense.
5. Make page headings descriptive - make them descriptive and specific keywords. When you create headings, pages, content etc always be thinking 'what would someone type into a search engine to find me'?
6. Ensure content headings have your keywords in them - when you format a piece of text as Heading 1, 2 or 3 on a page, ensure that it is descriptive of the page information and includes some of your keywords.
7. Get lots of links - have plenty of links to pages on your website and external to your website. For example, if you display the logo of an association you are a member of, make sure you add a link to the image leading back to the association's website.
8. List your website in directories - It is very important to also list yourself in as many directories as you can e.g. Google Local Places, TrueLocal, StartLocal, Aussie Local etc as this creates links back to your website.
9. Submit your site to search engines - Bing, Yahoo, Google are the main ones to submit your website to.  This will ensure your website is indexed (i.e. scanned for keywords and content) faster.

A good free tool that will help guide you is The Reaction Engine.