How exactly does the Fire Tv Stick work?

Do I understand correctly that you just need a screen that you connect to the power and then plug the stick into a USB port? Can you then watch Netflix, YouTube and everything or do you need a special cable or something?

Of course you need fast internet (wlan) and subscriptions for the respective providers (Amazon Prime, Netflix, Disney plus) … THEN you can watch them on the TV

By the way, the stick comes in an hdmi connection… Not usb

HDMI, not USB. In addition to the things you mentioned, you of course need an Internet connection via Wi-Fi, as well as subscriptions for streaming services such as Prime, Netflix or whatever you want. YouTube or Twitch are of course free of charge, just like on other devices.