As in English, conjugated verbs are preceded by either a common noun (a person, animal, place, thing or idea), a proper noun (a name) or a subject pronoun. Subject pronouns are used in place of a noun, in English they correspond to I, you, he, she, it, we, you, they.
Here are the French subject pronouns :
Je becomes J’ before a vowel (a,e,i,o,u and y) !
You can keep practicing the subject pronouns by watching this video :