This article explains how to add your own fields to the Resources displayed on the Resources & Types tab.
This article assumes that you have already created the fields you want to display. If not, see this Salesforce article: https://help.salesforce.com/articleView?id=customize_customfields.htm&type=5
Your custom field will now show up on the Booker25 layout of every Resource.
It could be that you have custom fields which make sense for one resources of one type, but not for another. You can achieve this by creating field sets with a name matching the resource type.
In Setup, go to the Resource object in the Object Manager.
Your custom field will now show up on the Booker25 layout of Resources of the specified type.