Subject and Object Pronouns

Subject Pronouns : I, You, He, She, It, We, They
Object Pronouns : me, you , him, her, it, us, them

Subject - is the person or thing doing the action.
Example:
- She went home.
- They said hello.

Object - is the person or thing receiving the action.
Example:
- I hit her.
- She called me.

Reference: Grammar Practice for Pre-Intermediate Students.