Check out example codes for "how to add a youtube video in html". It will help you in understanding the concepts better.
Code Example 1
<!-- You can add lots more fuetures than this by the way...
- Find a YouTube video
- set width and height
- copy the embeded URL into the src value
-->
<body>
<iframe width="420" height="345"
src="https://www.youtube.com/embed/tgbNymZ7vqY">
</iframe>
</body>
Code Example 2
<iframe width="420" height="315"
src="https://www.youtube.com/embed/tgbNymZ7vqY">
</iframe>
Code Example 3
<iframe width="420" height="315"
src="https://www.youtube.com/embed/tgbNymZ7vqY">
</iframe>
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