What is prerequisite to learn Cloud Computing and gettting job in IT- Industry ??

I want to go in IT-Sector and cloud computing is the trend in software industry my question are as follows .

1. How to learn Cloud Computing

2. Prerequisite to learn it

3. What about the number of jobs in this field .

4. Does smaller company with revenue of Rs 25 laks annum have cloud computing.What is prerequisite to learn Cloud Computing and gettting job in IT- Industry ??
U must be a student of be or b.tech , or bsc . But u must learn it online .

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