Learn to write a blog

Some people advices college stdudent shoud learn to write a blog.To record beautiful life and think
something meaning about life.
And some guys tell me that it's necessary to have a blog for a technician.
1.Notes studying.
It's a common phenomenon for technicians .They usually do some summarys and reproductions initially.Running a account to notes pieces of knowledge point.
2.Do some summarizes.
Such articles come from personal experience of successful and failing projects.By analyze the problems to get the reasons,and get the key about the problem.After do some analysis,summary,conclusion,it's access essential more.

3.Making friends.

Especially in IT industry,technological changed fast,so we need to write a blog more.We share our knowledge to others,and we could make more friends,and we could communicate with them online and offline.
4.Others.
Uncertainty.