hi guys i am a total noob to bikes and everything.
got a few questions hope you guys can help me out
1. on youtube i type in mountain biking or xc it always shows those high speed down hill video, is there any decent demonstration of xc or any non-downhill mountain biking?

2. ive also seen some videos from danny macaskill and i noticed (if not mistaken) his bikes dont have any suspension and his doing all those jump and drop. Why do we need suspension to be so good on mountain bikes?

1: Easier to make a segment with DH and freeride than it is for XC. Plus XC is a bit like golf, fun to play, boring as all get out to watch. There are some exceptions though, you just have to find them.

2: In some senses rigid teaches better technique, but suspension does help make line selection much easier. Macaskill is a trials/street rider where suspension can be a major hinderance, plus rigid makes a trials/street bike lighter.