This brief guide explains the basic concepts behind WordPress and how to update your website. It does not attempt to cover everything in depth but shows the features most likely to be of use to you, and some of the specific customisations for your website with Skirrid Systems.
You can also find a good in-depth tutorial on using WordPress at the Easy WP Guide website, which you can use as an online resource or if you prefer to download it as a PDF file. It is a sizeable piece of work and I don’t recommend printing it, or trying to read through the whole document. Just dip in when you need more detail on a particular subject. Please note that documentation can take time to update, especially after a major WordPress update. It’s a free resource and the author is updating it in his spare time.