Writing articles for money is one of them. In order to earn cash in such a way you need some writing experience, basic understanding of how search engines work and some free time to write articles and improve your skills. It should not be forgotten that you are writing for real people, so proper grammar is always a need.
You can start making money by writing articles with such sites as:
Later on I will be showing other sites for making money by writing reviews and articles and will try to feature some other ways to earn cash from home.