I didn't have one of the devices that thing 2 had links to tips and videos for, so I did a Google search for "tips and tricks" for my specific device. There were a lot of websites with information, and ranging from basic things like how to access the notifications screen, to things about how to access "developer options," which I will probably never touch again in my life. I waded through a good amount of tips, and although some things were over my head, and others I already knew--which boosted my confidence--I did learn some good and handy things.
I found out how to take a screenshot on the device, which is the rather unintuitive result of pushing two specific, but unrelated (either to each other or to screenshot-making) buttons at the same time. I find it somewhat less simple than the website had said, but after pushing and holding or not holding the two specific buttons over and over, I am able to now take a screenshot. This could come in handy at some point, I guess.
I learned how to put my contact info on the home screen of my device in case it gets lost by me and found by someone else. A good thing.
I learned about different network modes, and changed mine from the default "global," which is superfluous for me. From what I read, though, I don't think it actually does anything different on "global" so long as I remain in the country.
I also found out that my device can act as a USB storage drive if I hook it up to a computer, and that was a good find. Very good to know for if I need to store or transfer something when I do not have a flash drive with me.
I learned some good things, and I hope to continue! :)