The particle mo (も) is mainly used to mean "too" or "also". Thought this partile can be used to express more feelings for now we will start with its basic use. Lets take a look at some sentences to see how it is used.
Also eat bread = pan mo taberu
I also will drink = watashi mo nomu
Also like this = kore mo suki desu (これも好きです)
As you can see it is used just like WA or GA in a phrase. You can also use it without stating a word at the end of the phrase.
Me too! = watashi mo!