6. Leave Space
When you have access to thousands of cute Joomla extensions with useful functionality, you might be tempted to put many of them on your site. Moderation is key – don't clutter every inch of your site with images, extensions, etc. just because you can. Leave some space because this is a usability recommendation.
7. Create Eye-Pleasing Error Pages
Eye-pleasing error pages are useful for any site and Joomla sites are not an exception. Spend some time to design a good-looking 404 page, site offline page, etc. and your visitors will be much happier. This also shows that the site is regularly maintained, which can help to bring back visitors instead of driving them away!
8. Make Important Information Pages, Not Articles
Pages and articles are very different, as far as Joomla is concerned. Pages are for more eternal stuff (like About Us, which is not modified frequently), while articles are just posts you publish all the time and bit by bit they do down in the archive. This is why, if you have something important to tell and you want to make it stay on the front page forever, just make it a page, not an article.
9. Fill the Contact Form with Meaningful Data
The Contact form is the major way in which your visitors can get in touch with you, so don't neglect it, Enter meaningful (and true!) data in the contact form and post a test inquiry just to see if you will get it.
10. Turn on Caching to Speed Page Load
Even if you host with a reliable hosting provider and your Joomla site is not packed with images, videos, animations, ads and other stuff that loads for ever, still there is a lot you can do to speed up page loading. One of the easiest steps in this direction is to enable Joomla cache. In the admin area, select Global Config, then open System and in Cache Settings select “Yes" for Cache.