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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