Troubleshooting the Arduino Blink Sketch (Program)

For Christmas, I signed myself up for the "Creative Engineering with Mark Rober". As part of the class we have to build something with an Arduino. Below is a link to my project. I created this video to help one of my peers in the class with their project.

I have post four videos for the project:

Link to the Creative Engineering with Mark Rober class:

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Tools used to make my videos:
Video Editor Software: Davinci Resolve
Camera Samsung Galaxy S8 Phone & Canon EOS M50
Mic: Rode Videomic Shotgun microphone with Rycote Lyre Suspension

[Hakucho]

Thanks for the video. I worked out that the LED_BUILTIN macro wasn't resolving to the correct pin number (which for my board is 13). Turns out I had the wrong board type selected in the IDE, and once I fixed that, the macro resolved to 13 as expected and the LED started flashing properly.

[Hakucho]

At 4:43, you have the LED wire in socket 12, not socket 13. So why is the LED still blinking? A few frames later I see that the wire is back in socket 13.