Hello Naresh,
My friend start blogging 3 years ago, according to him It's quite complex to make a career in blogging.
First of all, you need to have patience. I have seen various newcomers creating a site and expecting to earn within few months.
It almost takes the 6 months to grow and make income provided if you are a good blogger, have geniune content.
But i will say nothing is tough unless you lose interest in it. First gain experience and see if you can work in long run or not. It all depends on you, how you take it.
However, here are some things that you need to know if you want to choose blogging as a career.
All the best
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