Please show me example sentences with aquí, acá, and allí - I don’t get the differences and always feel stupid saying por acá. . Tell me as many daily expressions as possible.

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Don't feel stupid, the differences between adverbs are imprecise and even the natives confuse them ...

Allí = " in that place or in that case or time". Example: allí está sentado (There he is sitting)

Aquí = ' in this place or time '. Example: Aquí estoy (im here)...

Acá = " the idea of ​​movement". Example: vamos acá (let's go over here) ven acá (come here)

-Aquí esta mi casa. (estoy dentro de mi casa y te la estoy mostrando)

-Ven para acá. (Estoy diciéndote que camines hacia mi)

-Yo trabajo allí. (Mientras te señalo con la mano el lugar donde trabajo)

También puedes usar “ahí” en lugar de “allí”

You can use “aquí” and “acá” as the same meaning, to something is close to you.
Ej. ¿Dónde está el libro? Aquí está.
Ven acá.

You can use “allí” and “allá” for something is away from you.
Ej. ¿Dónde está el libro? Allí/allá está.
Lo dejé por allá.

AQUI en mi casa mando yo. Te espero AQUI en mi casa.
Pon esa maseta ACA, no donde tu quieras. ACA en Mexico la gente es trabajadora.
ALLI donde pusiste tu auto es muy peligroso. Pon la maseta ALLI.

Little trick for your better understanding in addition to the other answers:
Aquí = Here
Acá = Exactly the same as "Aquí" = Here. In some countries of Latin America (For example, Argentina) we just use "acá" all the time to say "here", not "aquí". The meaning is exactly the same.
Allí=There. It's exactly the same as "allá", and, as I said with "aquí", it's not used in Argentina. It's because it's unnecesary! If we can already use "allá", why should we use "allí"? 😁😁

In summary:
Aquí = Here.
Acá = Here.
Allí = There.
Allá = There.