I would just like to check if there's any link / page that talks briefly about all the built-in reports in Nagios XI? We rely so much on the reports on our existing monitoring tool but since we'll be using Nagios in few more weeks, we need to be at least familiar with the built in reports, how to use it and how to interpret it.
A quick way to learn about them is through our YouTube channel, you can actually click on the grey question mark on the top right of each report, and view the video it shows you there. Not all reports have this feature yet, as some were implemented more recently. We can also help answer your questions directly, here.