Navigate to the page where you want to add your database

Type "/database" and select "Database inline" or press [[enter]] if that's the highlighted option

Click into the first column header to change its column header

Note - the first column of every Notion database must be a Text column (i.e. the content of each cell below it will be the Text type)

Double-click the "Property name" to update the name

Click the next column's header to make additional edits

Click "Edit property" if you need to make edits to the content type

For example, you can change any column's property type by clicking "Type"
Click here.

For example, you can change any column's property type by clicking "Type"

How to Create and Customize a Database in Notion