Alle beundrer skjønnheten.

• Alle = the subject, meaning everyone / everybody / all people
• beundrer = the finite verb, meaning admires
• skjønnheten = the direct object, meaning the beauty

So the structure is the very common Norwegian pattern:

subject + verb + object

Because Norwegian usually puts the definite article at the end of the noun instead of using a separate word before it.

So:

• skjønnhet = beauty
• skjønnheten = the beauty

That -en ending is doing the job that the does in English.

Because skjønnhet is the indefinite/basic form, while skjønnheten is the definite singular form.

Compare:

• skjønnhet = beauty / a beauty
• skjønnheten = the beauty

If the meaning shown to the learner is the beauty, then skjønnheten is the form you need.

Because beundrer is the present tense form of the verb å beundre.

• å beundre = to admire
• beundrer = admire / admires

In Bokmål, many verbs form the present tense by adding -r to the infinitive.

No. Norwegian verbs do not change for person the way English verbs do.

So you get:

• jeg beundrer = I admire
• du beundrer = you admire
• han beundrer = he admires
• alle beundrer = everyone admires

The verb form stays the same.

Here, alle means everyone / everybody.

Depending on context, alle can also mean all:

• Alle kom. = Everyone came.
• alle barna = all the children

In your sentence, since alle stands alone as the subject, the most natural English meaning is everyone.

For a yes/no question, Norwegian usually puts the finite verb first:

Beundrer alle skjønnheten?

That means Does everyone admire the beauty?

This is a very common pattern in Norwegian:

• statement: Alle beundrer skjønnheten.
• question: Beundrer alle skjønnheten?

The basic order here is the normal one:

Alle beundrer skjønnheten.

Norwegian does allow other elements to come first, but the verb still usually stays in second position in main clauses. For example:

I dag beundrer alle skjønnheten.
= Today, everyone admires the beauty.

So beginners should remember:

• the basic order is subject + verb + object
• in main clauses, Norwegian often follows the verb-second rule

Those are two sounds English speakers often find tricky.

• skj is usually pronounced like a soft sh sound
• ø has no exact English equivalent; it is a rounded vowel, a bit like saying the vowel in bird while rounding your lips more
• the double nn means the n sound is held a little longer

A very rough English-style approximation of skjønnheten might be something like shurnn-heh-ten, but that is only approximate.

The important thing is:

• skj is not pronounced like English sk
• ø is a special Norwegian vowel, not the same as o or e