In Spanish, you have 2 verbs for "to be"
ser
soy
eres
es
somos
sois
son
you use "ser" to express
days, hour...
origin
occupation
possession
qualities
what is something made of
where does an event take place
relationship (who is este hombre?. Este hombre es su padre ( Who is this man ? This man is her father)
.......
Estar
estoy
estas (accent on the a)
esta (accent on the a)
estamos
estais (accent on the a)
estan (accent on the a)
You use "estar" when you talk about how something is
You use "ser" when talking about what is something.....
Ser is more for descriptions, occupations, characteristics, origins, time as I told you before
Estar
Think about PLACE
P = physical posture or position
L = location if the location isn't an event (in this case =ser)
Mi casa esta cerca de ....
A = action + Present or past participles (estoy escribiendo = I am writing)
C = conditions (physical and mental) (estoy cansado = I am tired)
E = emotions (I am happy = estoy feliz)
About SER it was DOCTOR (not sure I remember)
D = decription
O = ocupation
C = characteristics
T = time
O =origin
R = relationships
in fact, that what I try to tell you before but I had forgotten these 2 PLACE and DOCTOR . I know there's another one for "estar" but I can't remember.
Anyway, those two are very tricky !!!
hope I helped !!