How to use database categories

[Fawk]

I'm trying to set up a news section which is similar to https://invisioncommunity.com/news/

I created a database and attached few categories and I'm getting the following message

"You have 2 categories in this database. You can only have 1 category to store records in the database directly. If you wish to disable category support please move articles to a single category and delete the no longer needed categories."

I guess I have a couple of questions.

1. If I want a news page with multiple categories, I will need to have multiple databases acting as the categories on multiple pages?

2. What are some examples of database category usage?

3. Why allow more than 1 category to be created if only 1 is allowed?

[Meddysong]

Ignore it. You've gone about things the correct way. That text always misleads people into thinking they've done something wrong and need to change it.

[opentype]

https://www.opentype.space/superdocs/ips-community-tips/pages/you-can-only-have-1-category-to-store-records-in-the-database-directly-r1/

[Fawk]

Thanks @Meddysong and @opentype. It makes more sense now.