So I know, you might have got some idea now, but to make sure you get it right, here is an example

Let say you are just starting up your business and like a passionate business owner, you would love to be perceived as a professional (or kind of big) business, by creating different email addresses such as yourname@yourdomain.com, anothername@yourdomain.com, support@, sales@, helpdesk@ etc, but it will be just you behind the scenes.

In this case, you can buy one license which will be your primary G Suite mailbox (with using G Suite basic or business promo code), and then put other accounts as nick names in recipient address table, and now you are free to give these emails addresses to your network, because when people send emails to any of your ids, it will come right in your primary mailbox.