If you have just entered the world of bitcoin it is necessary to watch and learn from these video
1. How to mine bitcoin
http://www.youtube.com/watch?v=j7opj5-32hw
2. Mac OS Mining, Tips, Mining Software, Wallets And More
http://www.youtube.com/watch?v=ZEV3QFj19u8
3. Pools and how to buy bitcoin and trade it 
http://www.youtube.com/watch?v=pvrVtCOGTWY
http://www.youtube.com/watch?v=GzSPSK6cn8E
4. Cloud Mining & Cloud Hashing
http://www.youtube.com/watch?v=Bd1doftVUHg
5. How To Buy Gift Cards Using BitCoin
http://www.youtube.com/watch?v=Ibh0AnQuyyA