alguno means 'some' or 'any' in English.
pronoun
Meaning: some
Tengo algunos libros en mi estantería.
I have some books on my bookshelf.
Meaning: any
¿Tienes algún problema?
Do you have any problem?
Meaning: someone
Alguien llamó a la puerta.
Someone knocked on the door.
Meaning: anyone
¿Hay alguien que pueda ayudarme?
Is there anyone who can help me?
A1: ¿Tienes alguno?
A1: Do you have any?
A1: No tengo ninguno.
A1: I don't have any.
A2: ¿Has visto a alguno de mis amigos?
A2: Have you seen any of my friends?
B1: Quiero comprar algún libro interesante.
B1: I want to buy some interesting book.
B1: Necesito algunos consejos para mejorar mi inglés.
B1: I need some tips to improve my English.
B2: Algunos estudiantes han decidido no asistir a la reunión.
B2: Some students have decided not to attend the meeting.
C1: Me gustaría tener algún conocimiento sobre el tema antes de empezar.
C1: I would like to have some knowledge about the topic before starting.
C1: Estoy buscando algún trabajo relacionado con mi experiencia.
C1: I am looking for some job related to my experience.
C2: Si tienes alguna duda, no dudes en preguntarme.
C2: If you have any doubt, feel free to ask me.
The Spanish pronoun alguno is used to refer to an indefinite quantity of something. It can be translated as 'some' or 'any' in English. Alguno agrees in gender and number with the noun it modifies, so it has different forms: alguno (masculine singular), alguna (feminine singular), algunos (masculine plural), and algunas (feminine plural).
Alguno is often used in affirmative sentences when referring to an unspecified or unknown quantity of something. For example, 'Tengo algunos libros' means 'I have some books'. It can also be used in negative sentences to mean 'any', such as 'No tengo ningún problema' which translates to 'I don't have any problem'.
In addition to its use as a pronoun, alguno can also function as an adjective. In this case, it precedes the noun it modifies and agrees in gender and number with it. For example, 'Algún día' means 'Some day' and 'Algunos amigos' means 'Some friends'.