A tini site is helpful when you have a lot of content and can be an alternative place to send people from your website (but shouldn't necessarily replace it).
You can view an example of a Tini site here: fs.tini.app You'll see that you can get to the website if needed or in the event you just wanted to purchase a book, you can easily do that too.
A Tini site is easy to setup and send to your customers.
Just have a list of places you want to send your customers (landing pages, external website, checkout Pages, etc...) then follow the instructions found here and you can have it all created within a few minutes.