Adding video to coding

Hi all,
A quick question please and hope someone can help / advise; I know how to install video for things like eg “video/mp4”
However, how would I/can I input a short video clip fromyoutube?
I am currently attempting a project for my 1st code review on the FullStack Course (currently at 21%)…and I prev did the “excursion” project…and used video there and I inputted the link address for the source src…and type=“video/mp4”
but I am trying to add video (link:…but cannot work out how to add this and/or the “type” ??