Hi there folks!

So i've been making some downfall parodies about my friends, however they've now requested something bigger - so now i have to mix something together from youtube clips, but i'm not exactly sure what's the easiest and best way of getting them.

Please Help.
Thanks !

I didn't find the right solution from the internet.
References:
-https://www.thebuddyforum.com/threads/anyone-know-easiest-way-to-download-from-youtube.94105/
-Healthcare Services Video Examples