I would generally leave ospf parameters like the hello timers at the defaults unless there is a compelling reason to make them more aggressive like a design for faster convergence and failover among multiple devices.
You can find Palo Alto's general ospf deploy descriptions here:
RIB: Routing information Base - this is the current listing of best routes used by the router to forward packets arriving on the device. This gets built out of the FIB table based on the metrics assigned to each route as it is learned by the router.
FIB: Forwarding information Base - this is a complete list of all available routes that the router knows about for reaching destinations. This will include additional duplicate routes for the same destinations that are not rated as good as the route for that same destination that gets installed into the RIB. Routes are added as they are learned from sources and removed as neighbors either are lost or withdraw routes. These changes may or may not then cause an update to the RIB.
Essentially, the RIB is your active routing table.
On Palo Alto your main commands would be:
show routing route
show routing fib
Also helpful is
show routing summary
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