Acclaimed as one of the best and simplest wordpress plugin to run multiple websites from a simple wordpress installation. You do not need to go into the complexities of wordpress multi user. Just install the wordpress simple. Like you do for any new website.
Suppose that you installed WordPress on example.com. Of course you can access it on that domain domain you can also have the following options:
Note: In all of the following three options, you may have a different theme, different settings, different content, different pages and different widgets on each sub website. You will do these settings in our Multi site plugin settings in WordPress admin for each domain, sub domain or sub folder.