Yes, once I create your website, I will supply you with some basic instructions for updating information on your website, depending on what sort of website you have chosen (a basic information site, blog, e-commerce, and so on).
I am more than happy to perform content updates for you if you would prefer me to do that (see my maintenance page for more details about support plans) but if you would prefer to you feel comfortable enough to make small simple changes yourself and not have to wait to get things updated, I can support you to do that.