Could you tell me what are the ways I can earn by writing some books from being at home?

Question

I have completed M.E in computer science and working as a lecturer. I am floating at the age 31. I have to be in the college for 8 hours, I want to utilize the remaining hours. I am also interested to write the computer science books. that is why I asked the question how to earn more by writing the books at home.

Answer 1

First of all - what is your primary language?

Not to be offensive, but your English - at least in writing - seems to be very broken.  If you plan on writing in English then I would take some college writing courses first.

Answer 2

you can write a book then make a site and an ebook out of your book, and sthen ell it in on your site, if it's successful you could sell it on other sites.

Well it's just what a lot of people do