Optimizing you anchor text is extremely important, especially for your on-site URL's. When building in internal link structure, this is the most important issue to look at. Instead of using an anchor text like "Click here", you should use someting like "Joomla Caching".
This provides meaning and context to the URL you are pointing at. You can easily arrange this in your editor. If you use JCE, it might even help to suggest good anchor text.
Once your site is live and you are ready for your linkbuilding activities, keep this practice in mind as well, it is equally important there.