I guess learning how to embed links would be useful. So I am sharing with you how to do it from YouTube.
1) Go to the YouTube video you are interested to share (http://www.youtube.com)
2) Look for the Embed Link
3) Copy this Link
4) Paste this Link at the place where you want to show the video
These 4 steps are easy to accomplish. For me, the greatest difficulty was knowing where to find the Embed Link in YouTube. And I have made a picture for you to find it easily.
Do let me know if this helps you.
You can do it too!