How to write a Simple but Successful blog

Today I was thinking about a very common question, How to write a blog post that can be of a great use for many of us.

First of all I need to understand what I know the best, and what can I write and explain the best.

Complete knowledge and perfect writing makes a blog post a hit(both in the mind of reader and on Google)

Let me explain you all this with a few simple examples:

1) A bird can fly but cant write there experience of flying, but a human being cant fly but he can write it.

2) But a human being can swim so he can write his experience about swimming best.