Understand when to use WordPress Multisite
If you plan to have more than one WordPress-powered website or blog, there are different ways to accomplish this. One option is to install multiple independent WordPress instances on the same server. Another option is to install WordPress Multisite, which lets you create and manage multiple WordPress blogs/websites from a single WordPress instance.
WordPress Multisite might be a good option for you if you have multiple websites or blogs focused on the same industry or topic - for example, a network of food or travel blogs. In this scenario, WordPress Multisite lets you manage multiple websites from a common dashboard, and you have the added advantage of being able to share themes and plugins between your WordPress Multisite sites.
If, on the other hand, you have multiple websites or blogs, each with a different focus area, it would be better to use a separate WordPress instance for each website. This means, for example, that you would run one WordPress instance for your personal blog, another for your company website and a third for your family’s photoblog. This would maximize your flexibility and allow you to configure each WordPress website or blog differently, with independent themes, plugins and settings.