it means to be/ like how you are (more permanent traits)
so like
its is used when stating:
the hour, day, and date
place of origin
occupation
nationality
religious or political affiliation
the material something is made of
possession
relationship of one person to another
certain impersonal expressions
where an event is taking place
essential qualities
yo- soy -i am
tu- eres -you are
el/ella/usted- es -he she you(formal) is
nostoros-somos -we are
ellos/ellas/ustedes-son -they are
its very simple, in fact the most simple i have learned in high school.
you must know the conjugations as i wrote above
and then just use it accordingly.
so say you want to write
i am funny.
yo "soy" comica.
he is a doctor.
el "es" un medico.
it is 2 o'clock.
"son" las dos.
they are american.
ellos son americanos.
we are students.
nostotros somos estudiantes.