Po pracy chcę odebrać paczkę na poczcie.

Because the preposition po requires the locative case in this meaning.

• basic form: praca = work
• locative singular: pracy

So:

• po pracy = after work

This is a very common Polish expression. English uses after + noun with no visible case change, but Polish changes the noun form after certain prepositions.

In normal everyday use, po pracy simply means after work—usually after your workday or after you finish work.

It does not usually sound overly formal or philosophical like after the labor is completed. It is just the standard phrase people use.

Examples:

• Po pracy idę do domu. = After work, I’m going home.
• Po pracy spotkam się z koleżanką. = After work, I’ll meet my friend.

Chcę means I want.

It comes from the verb chcieć = to want.

This is the 1st person singular form:

• ja chcę = I want

So:

• Po pracy chcę odebrać paczkę na poczcie. = After work, I want to pick up a package at the post office.

A learner should also notice that Polish often drops the pronoun ja because the verb ending already shows who is doing the action. So chcę by itself already means I want.

This is about aspect, which is very important in Polish.

• odbierać = imperfective
• odebrać = perfective

In this sentence, odebrać is used because the speaker means a completed action: picking up the package successfully.

So:

• chcę odebrać paczkę = I want to pick up / collect the package

If you used odbierać, it would sound more like:

• a repeated action
• a process
• a habitual activity

For example:

• Codziennie odbieram dzieci ze szkoły. = Every day I pick up the children from school.

But with a single package, the completed-result idea makes odebrać the natural choice.

Because paczkę is the accusative case, used for the direct object of the verb.

• nominative: paczka = package / parcel
• accusative: paczkę

Since odebrać is doing something to the package, Polish uses the accusative:

• odebrać paczkę = to pick up a package

This is a very common pattern with feminine nouns ending in -a:

• nominative -a
• accusative -ę

For example:

• mam książkę from książka
• widzę kobietę from kobieta

Paczka usually means package or parcel.

In this sentence, it most likely means a parcel you are collecting from the post office.

Depending on context, paczka can also mean:

• a mailed parcel
• a package in general
• sometimes even a pack of something, in some contexts

But here the meaning is clearly parcel/package.

Because Polish idiomatically says na poczcie for at the post office.

Even though English might suggest in the post office, Polish commonly uses na with some institutions and places of service.

So:

• na poczcie = at the post office

This is just something you need to learn as a fixed usage.

Compare:

• na poczcie = at the post office
• na uniwersytecie = at the university
• na lotnisku = at the airport

Polish prepositions often do not match English prepositions one-to-one.

Poczcie is in the locative case.

The preposition na can take different cases depending on meaning:

• na
  • accusative = movement toward a place
• na
  • locative = location

Here, the meaning is location:

• na poczcie = at the post office

The base noun is:

• poczta = post office / mail / post

Its locative singular form here is:

• poczcie

Yes, a very important one.

• na pocztę = to the post office
  
  • direction, movement toward
  • usually accusative
• na poczcie = at the post office
  
  • location
  • locative

Examples:

• Idę na pocztę. = I’m going to the post office.
• Jestem na poczcie. = I’m at the post office.

In your sentence, na poczcie is used because it refers to the place where the package will be picked up.

Because Polish has no articles like English a/an/the.

So paczkę could mean:

• a package
• the package

And na poczcie could mean:

• at the post office

The exact meaning depends on context.

In real life, if both speaker and listener know which package is meant, English often uses the package, but Polish still just says paczkę.

This is very normal in Polish.

Yes. Polish word order is much more flexible than English word order.

The sentence:

• Po pracy chcę odebrać paczkę na poczcie.

is natural and clear. But you could also say:

• Chcę po pracy odebrać paczkę na poczcie.
• Paczkę chcę odebrać na poczcie po pracy.
• Na poczcie chcę odebrać paczkę po pracy.

These versions may shift emphasis, but the basic meaning stays similar.

The original version sounds very natural because it starts with the time expression:

• Po pracy = after work

That sets the scene first.

Yes, odebrać has several related meanings depending on context.

It can mean:

• pick up / collect
• receive
• take back
• pick someone up
• answer something like a phone call in some contexts

But with paczkę, the phrase odebrać paczkę most naturally means:

• pick up a package
• collect a parcel

So in this sentence, there is no real ambiguity.

A few words may feel difficult to English speakers:

• chcę
• odebrać
• poczcie

Helpful approximations:

• chcę: the chc cluster is tricky; the nasal ę at the end is often pronounced less strongly in everyday speech than learners expect
• odebrać: stress is on -brać? Actually in Polish the stress is usually on the second-to-last syllable, so o-de-brać
• poczcie: the czc cluster is also tricky; it sounds more natural once you stop trying to pronounce every consonant too separately

General stress rule:

• Polish usually stresses the penultimate syllable:
  • pracy
  • odebrać
  • poczcie

A good strategy is to listen to native audio and repeat whole chunks:

• po pracy
• chcę odebrać
• paczkę na poczcie

Yes, absolutely. It sounds natural.

Po pracy chcę odebrać paczkę na poczcie. is a normal, everyday sentence.

A speaker might also choose slightly different wording depending on context, for example:

• Po pracy chcę iść na pocztę odebrać paczkę.
• Po pracy odbiorę paczkę na poczcie.

But your sentence is perfectly natural and grammatically correct.