Mo も Particle
Use も when you're adding more information to already established information. It may be used alone when marking subjects and objects, and can follow other particles (like に, で, and へ). Put it this way: if は clears the existing data and replaces it, も adds additional data on top of what's already been said without clearing out anything.
あした パーティ に いく か
"[Are you] going to the party tomorrow?"
"Yeah, I'm going, how about you?"
ぼく も いく
"I'm going too."
The particle も is easy enough, so we won't waste any more time with it.