Challenges

In globaloria the challenge I had was to learn how to put cool things in my blog or wiki. That still is kind of a challenge for me but now I learned how to put pictures in my wiki or put the picture as my avatar. The thing I have problem with the most is on how to put videos in my blog. I know how to add links, pictures, and other stuff too but I don't know how to put videos in my blog. The main thing I want to learn is how do I put videos of any kind into my blog besides the ones that are not appropriate.