Answer 1

Use iframe

For Example:

<iframe width="420" height="315"
src="https://www.youtube.com/embed/tgbNymZ7vqY">
</iframe>

For more refer this

https://www.w3schools.com/html/html_youtube.asp

Answer 2

Copy the youtube video embedded code & paste it in ur website.

Answer 3

https://code.sololearn.com/W1fnIi9QQAt2/?ref=app