I feel like a dinosaue because i cant figure out how to downlaod stuff like yt-dlp

Like it says i should just type it into the command line but how the heck would the command line knowbwhat yt-dlp is? Makes no sense. Sounds like some shady business. I cant get over my own paranoia.
What a drag... and the instructions are just confusing in general...

If she is dead i wont date anyone for 3 years. And i will walk for an entire day without pause. 24 hours. It's probably not enough. But i really hope she is ok........ she is much too innocent to die so young... i mustn't allow it...