It is pretty easy to install Cassandra but as always I was still able to find it difficult so I thought of putting it down so I have it easy in the future.
Install Cassandra from its home page. One thing that you need to make sure is JAVA_HOME is setup.(Shouldn’t a problem if Java is already up and running ).
Then open a new cassandra window and type another command (this becomes your client)
(cant remember command)
P.S: There are some blogs that tell you to change a yaml file but dont try to do it first if it doesnot work first then well you have no other option.