I am fairly new to this business. I have a client who wants a website building and designed, but want to be able to update the pages themselves after I have finished the website. Now I understand you can get CMSs to enable clients to do this, but that's the extent of my knowledge on the subject, I don't know where to put it, how to add it, where to get it, what it is, if it costs, anything. Can anyone educate me please?

Thanks.