No videos that I know of but you'll always find things on Google, a bunch of sites about trading...
You click th third symbol from above on the left hand tab, the most useful allround is the fib retracement - it's pretty intuitive, you have to decide from what low to go, which makes the most sense... if in doubt, use the all-time low - the top is usually more obvious, at least in an upscale market ;)