HelpDesk default queue clarification

Summary:

Hello Everyone,

We are seeking for inputs on the below points with respect to Helpdesk.

1. How do capacities assigned to the resources work?
2. If the capacity for all the 5 resources is 50 each and they are part of default queue, then how does system assign any new ticket to the resource?
3. Is there a frequency set for assigning the tickets? Is it scheduled process doing it? If yes, how to check it?
4. If a new ticket is created and it is routed to default queue, then can we make any changes such that the ticket is assigned to HRIS queue instead of assigning it to any resource ?