How to embed video from YouTube page to my HTML page?

Hello everyone,

I'm learning to program in HTML, trying to make an HTML page in which different videos will be embedded. I want to know how to embed the videos from YouTube? There is a video tag in HTML but I guess it is for those cases in which your video is not on the net. Please clear my confusion.

>>9
Dear Reimu,

I sometimes forget that one of your most endearing charms is the naivety that the life as a lowborn heathen priest had endowed you with. It was foolish of me to offer you such a grand and high class evening, knowing that the appeal would be lost on you. Instead, I will be more direct and just say it: Reimu, you and I should have sex. If you like, we can invite Marisa and Flandre and make it even more exciting. Please at least think about it.

Love,

Remilia

P.S., I have not had sex in five hundred years.