Conjugation is the change of the verb in accordance with the personal pronouns. The English language only knows one conjugation - the one in the third person singular: he knows, she eats, it does. All other verbs for all the other personal pronouns stay unchanged:

Spanish verbs do change according the personal pronoun. That means they have different endings depending on which personal pronoun is used (or better: which person is talked about).

How this conjugation (= the change of the verbs) is formed depends on the basic form of the verb. Spanish verbs have the ending -ar, -er or -ir. Here are some examples:

hablar   sacar   tomar   pagar   jugar talk take away take pay play

comer   vender eat sell

recibir   presumir receive presume