Jira is not a database (although it does rely on one to store its own data behind the scenes).
You can use it to track anything that you can shape as an "issue". It is an issue-tracker, and does that best, but I've seen issues used to represent appointments, library books, hardware, cats, travel bookings, art, and, and, and...
A list of issues is always searchable, there are automation available in Cloud, and yes, there are some videos that might help you.
I'm the wrong person to ask about Atlassian videos though - I learn by doing, not by watching, so I don't bother with videos, hence I don't really know what to recommend. There are a lot of them out there, some by Atlassian, where I'd say you should start with https://www.atlassian.com/university , and basic searching should find you plenty of others. When you search, look for the stuff done by Atlassian partners and Community leaders, they I find them to be better than most. Honourable mention to @Ravi Sagar 's videos on Scriptrunner and other advanced topics because they're ones that I have learned from.
One small note of caution on the videos (and anything else you might find) - check the date. I had one incident where we created a video for a Cloud-based customer, delivered it, and then Atlassian made changes to Cloud the following week that invalidated half of it. Just make sure it is a recent video, or be aware that it might be out of date.
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