No problem, we all were at some point. But, in this case, I suggest that you start with something within your level of expertise and add a little challenge at a time to gain more knowledge in little increments. Can you write (and i mean write yourself, not grab from God nows where) some little code to blink an LED? Two LEDs at different frequencies? Eight of them? A pushbutton that will toggle and LED on and off with each pulse? A pushbutton that will cycle amongst five different blinking patterns for your array of LEDs? Are you familiar withe finite-state machines? These, in my opinion, are useful building blocks to build stuff and write code for uCs, even if you never blink another LED again after that.
On the other hand, this is hardly a sound approach to programming (and to many other things too, but I digress...). Unless that guy (or gal) from Youtube has exactly your same problem and is using exactly your same hardware in exactly your same configuration, things are guaranteed not to work. Moreover, if you use code you don't understand, things will sooner or later go sideways on you, like what happened to this guy.