Ok, so first copy the link, then open chrome and paste it in the search box. Then edit the link by typing 'ss' before youtube like-
https://ssYoutube.com/<video code>
OR
https://ssyoutu.be/<video code>
This will open a website called SaveFrom.com
It then shows options in which you wanna save it, like resolution options and do you wanna save it with audio. That's all and it's quite simple