How Can one earn money through Adsense ??

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I have heard a lot about Adsense & ways to earn through a Blog & making a website. Can someone Plzzz help me understand this concept in depth . I couldn't understand the following points :- 1. How do I earn money? 2. What Kind of website / Blog topic do I choose? 3. How much I need to invest initially? 4. Is it guranteed income source? 5. Shall I take help of some specialised website creation company/person? Plzzzzzzzz Help ...Regards "Beetel"