Powering Four short 5v LED strips and Two 12v encoder motors

Hey Gil(?),
Thanks for your reply.
I'm just starting out with all of this stuff, not only Arduino but electronics as well. Unfortunately, I don't have good memory retention when it comes to these kinds of things; which is ironic since I can memorize pages and pages of dialogue when I'm working on a play, but anyways, that's on me.
I'm a visual learner not so much a textbook kind of guy, which explains my low grades in school.
I've looked at numerous YouTube tutorials but it seems to me that most if not all of them pre-assume the viewer has some knowledge of the subject matter which I don't, not really.
I understand that the Arduino is not a power supply, that it's a microprocessor, a mini-computer if you will.
As for drawing an electrical schematic, the best I can do is to sketch how I think the wires will run through W.A.L.D.O., but those would simply be lines that only I would understand, it would not be a proper schematic.
I've seen videos (see image) on how to connect a single 12v dc motor encoder, motor to the L298N motor driver, and then to the Arduino Uno board but not how to connect a second one, I mean where do I connect the second set of 4 wires to? (and here I'm assuming that the connection for a 12v dc motor would be the same for a 5v dc motor).
Most videos that show how to connect two motors are for dc motors without encoders.
I still don't understand how or even why I would use the other 5v power supply connection on the L298N if I'm using the 12v.
I get that I'm in deep waters here but I'm determined to learn how it works. I don't really have a choice, my friends are expecting me to produce this W.A.L.D.O. robot for their show and I don't want to let them down.
I can draw, design, create and build things with various materials but this electronic "stuff" is kicking my you know what.
So please, how can I help you, help me, in simple everyday English? I'm 62 but please try to explain things as if I were 10; if you can.
And again, thank you for your reply.