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Subject pronouns in English are I, you, he, she, it, we, you and they.
They are used before a verb to explain who is doing the action, eg I play, they play.
In italian this is already clear from the ending of the verb so often the subject pronoun is not specified.
Let’s use an example with the verb ‘to play’ - ‘giocare’:
I play - gioco
They play - giocano.
However, subject pronouns are used if we want to stress in particular who is doing something. In this case, the pronoun is used after the verb.
I‘ll play - gioco io
You do it - fai tu

Here are all the subject pronouns:
I - io
you - tu
he - lui
she - lei
it - lui/lei (depends on whether it is masculine or feminine)
we - noi
you - voi
they - loro