Yo means I.
In Spanish, it is very common to avoid saying personal pronouns.
Some personal pronouns are yo, tú, él, ella. They are equivalent to the words I, you, he, she.
Let’s see some examples with yo.
● Yo tomo café por las mañanas. (I drink coffee in the morning.)
Though the above sentence is correct, you will most likely never hear a native Spanish speaker say: “Yo….”
We skip yo, and simply say:
● Tomo café por las mañanas. (I drink coffee in the morning.)
Tomo means “I drink.”
In Spanish, verbs change depending on the person they refer to. A verb in Spanish expresses the person who performs the action and the time in which that action occurs.
Take a look at how a verb changes depending on the person you refer to.
● Tomo café. (I drink coffee.)
● Tomas café. (You drink coffee.)
● Tomamos café. (We drink coffee.)
● Toman café. (They drink coffee.)
I explain this topic in more detail in the post How to Conjugate Regular Verbs in Spanish.