Of course you can! A Content Management System contains several elements that allow you to save costs. Certain functions, thanks to all kinds of plug-ins, are free and you do not have to buy them separately. In addition, you also get a lot of templates and images ... In fact, a good CMS has dozens or even thousands of templates and free images to choose from. By the way, because a CMS like WordPress is open-source, you don't have to pay to use it, you just need hosting to put your website online.