Du kan välja vilket erbjudande som helst, men läs allt först.

Because erbjudande is an ett-word in Swedish: ett erbjudande = an offer.

The word vilken/vilket/vilka has to agree with the noun:

• vilken
  • common gender (en-word)
• vilket
  • neuter (ett-word)
• vilka
  • plural

So:

• vilken bok = which book
• vilket erbjudande = which offer
• vilka böcker = which books

Since erbjudande is neuter singular, vilket is the correct form.

Som helst is what makes the phrase mean any ... at all or whichever ... you like.

So:

• vilket erbjudande = which offer
• vilket erbjudande som helst = any offer / whichever offer

This is a very common Swedish pattern:

• vem som helst = anyone
• vad som helst = anything
• vilken bok som helst = any book
• vilket erbjudande som helst = any offer

Without som helst, the phrase would sound like an actual question word: which offer. With it, it becomes indefinite: any offer.

Because kan is a modal verb, and modal verbs in Swedish are followed by the bare infinitive.

So:

• kan välja = can choose
• måste läsa = must read
• vill gå = want to go

There is no att after modal verbs in this kind of sentence.

Compare:

• Jag vill läsa. = I want to read.
• Jag försöker att läsa. / Jag försöker läsa. = I try to read.

In your sentence, Du kan välja is exactly the normal structure: You can choose.

Because läs is the imperative form: a command or instruction.

• du läser = you read / you are reading
• läs! = read!

So:

• men läs allt först = but read everything first

In Swedish, imperatives usually do not include the subject du.

Natural:

• Läs allt först.

Possible but more marked:

• Läs du allt först.

The version without du is the normal one for instructions.

Allt means everything here.

It is the neuter form of all when used on its own as a pronoun:

• all = all (common gender)
• allt = all / everything (neuter or pronoun use)
• alla = all (plural)

Examples:

• allt är klart = everything is ready
• läs allt = read everything
• alla erbjudanden = all the offers

So läs allt först means read everything first, not just one part of it.

Först is an adverb meaning first, and in this sentence it naturally comes after allt.

• Läs allt först. = Read everything first.

This placement is very normal in Swedish. It tells you the order of actions:

1. read everything
2. then choose

You could move adverbs around in some contexts, but Läs allt först is the most natural everyday wording here.

Because men is a coordinating conjunction, like but in English. It links two main clauses, and the second clause keeps normal main-clause structure.

First clause:

• Du kan välja vilket erbjudande som helst

Second clause:

• men läs allt först

If the second clause had a subject and a finite verb, the normal order would still be used after men:

• Du kan välja ..., men du måste läsa allt först.

Inversion in Swedish usually happens when something else comes first in a main clause, for example:

• Först läser du allt. = First, you read everything.

But after men, you do not automatically invert.

It is not one single fixed word-for-word chunk, but it is a very common pattern in Swedish.

The pattern is:

• question word + noun (if needed) + som helst

Examples:

• vem som helst = anyone
• vad som helst = anything
• vilken film som helst = any film
• vilket erbjudande som helst = any offer

So yes, learners should treat it as a familiar pattern worth memorizing.

Not with exactly the same meaning.

• vilket erbjudande som helst = any offer / whichever offer
• något erbjudande = some offer / any offer in certain contexts, but less specific here

In this sentence, vilket erbjudande som helst fits best because the idea is: out of the available offers, you may choose whichever one you want.

If you said något erbjudande, it would sound less natural for this specific meaning.

In the first clause, du is needed because it is a normal statement:

• Du kan välja ... = You can choose ...

In the second clause, the verb is imperative:

• läs ... = read ...

Imperatives in Swedish normally do not use an explicit subject. That is why the sentence mixes:

• statement: Du kan välja ...
• command/advice: men läs allt först

This is completely natural.

Here, erbjudande is a noun meaning offer.

It comes from the verb erbjuda = to offer.

A lot of Swedish nouns ending in -ande or -ende come from verbs. In many cases, these nouns are neuter:

• ett erbjudande = an offer
• ett meddelande = a message
• ett beteende = a behavior

So if you see erbjudande, it helps to remember:

• verb: erbjuda
• noun: ett erbjudande

It is neutral and natural everyday Swedish.

Because it uses du, it is the normal modern way of addressing one person in Swedish. Swedish usually uses du in both informal and many formal contexts, much more than English uses first names or you in a special way.

So this sentence could appear in:

• a website
• an ad
• instructions
• customer information

It sounds direct but not rude.

The main stress would usually fall on the important content words:

Du kan välja vilket erbjudande som helst, men läs allt först.

A speaker would often stress:

• välja
• erbjudande
• läs
• allt
• först

If they especially want to emphasize freedom of choice, they might stress som helst more clearly:

• vilket erbjudande som helst

If they especially want to emphasize the warning/advice, they might stress:

• men läs allt först