Well to Start of There are many types of Marquees. They are very useful for quick news, showing links, and fun. 
I wish try my best to cover the major ones as good as i can. I would recommend that you copy these codes down, and test them in a ".html" page to see what they do.
Slide-in Right
Code
<marquee behavior="slide" direction="left">Test Text.</marquee>
For this Marquee the Text will start from the right, and stop at the left.
Slide-in Left
Code
<marquee behavior="slide" direction="right">Test Text.</marquee>
For this Marquee the Text will start from the left, and stop at the right.
Continually Scrolling Marquee
Code
<marquee behavior="scroll" direction="left">Test Text.</marquee>
For this Marquee the Text Continually Scrolls toward the left. (From Right to left)
Code
<marquee behavior="scroll" direction="right">Test Text.</marquee>
For this Marquee the Text Continually Scrolls toward the right. (From Left to Right)
Bouncing Marquee
Code
<marquee behavior="alternate">Test Text.</marquee>
For this Marquee the Text will Continually Bounce between the left and the right side.
Upwards Marquee
Code
<marquee behavior="scroll" direction="up">Test Text.</marquee>
For this Marquee the Text will Continually Scroll Up from Top to Bottom.
Downwards Marquee
Code
<marquee behavior="scroll" direction="down">Test Text.</marquee>
For this Marquee the Text will Continually Scroll Down from Bottom to Top.
You can also try...
Adding in an Image, all you have to do is replace the "Test Text." with
Code
<img src="IMAGEURLHERE" width="40" height="40" alt="IMAGEALTERNATEHERE/
Changing the Speed
Change the code to this.
Code
<marquee behavior="scroll" direction="left" scrollamout="1">Test Text.</marquee
The Higher you go, the faster it goes. Thanks for Reading!
