Hello Vikkisses,
Saber:
as a transitive verb
1.to know (conocer)
ya lo sé -> I know
de haberlo sabido (antes) o si lo llego a saber, me quedo en casa
if I'd known, I'd have stayed at home
hacer saber algo a alguien
to inform somebody of something, to tell somebody something
para que lo sepas, somos amigos
we're friends, for your information
2.(ser capaz de)
saber hacer algo
to know how to do something, to be able to do something
no sé nadar
I can't swim, I don't know how to swim
sabe hablar inglés/montar en bici
she can speak English/ride a bike
3. to learn, to find out (enterarse de)
lo supe ayer
I found out yesterday
¿sabes algo de Juan?, ¿qué sabes de Juan?
have you had any news from o heard from Juan?
4. to know about (entender de)
sabe mucha física
he knows a lot about physics
5. (expresiones)
no saber dónde meterse
not to know where to put oneself
no sabe lo que se hace
he doesn't know what he's doing
no sabe lo que tiene -
he doesn't realize just how lucky he is
no sé qué decir
I don't know what to say
¡qué sé yo!
how should I know!