Læg tasken i garderoben, før du går ind i salen.

Læg is the imperative form, used for commands.

• at lægge = to put / to place
• læg! = put!

So in a command, Danish usually uses the bare imperative form without at:

• Læg tasken... = Put the bag...

This is similar to English using put, not to put.

Tasken means the bag. In Danish, the definite article is usually added to the end of the noun as a suffix.

• taske = bag
• tasken = the bag

So Danish often says:

• tasken rather than den taske

You use den taske only in special cases, for example when an adjective is present:

• den sorte taske = the black bag

In this sentence, tasken is the normal way to say the bag.

Here, garderoben most naturally means the cloakroom, coat check, or changing/coat area, depending on the setting.

It does not usually mean a furniture wardrobe in this kind of sentence. Because the sentence mentions going into salen (the hall/auditorium), the context is probably a public building such as a theater, school, or event venue. So garderoben is the place where you leave coats, bags, and similar items.

I usually means in or into, depending on context.

Here, i garderoben means in the cloakroom / into the cloakroom area. Danish often uses i where English might use in, into, or sometimes a more context-specific phrase.

So:

• læg tasken i garderoben = put the bag in the cloakroom

This is the normal preposition with places you place something inside.

This means before you go into the hall/auditorium.

It breaks down like this:

• før = before
• du = you
• går = go / are going
• ind = in / inside
• i salen = into the hall

So gå ind i is a common expression meaning go into.

Because gå ind is a verb + particle combination.

• gå = go
• ind = in / inside

Together, gå ind means go in or enter.

This works a lot like English phrasal verbs:

• go in
• come out
• sit down

In Danish main clauses, the finite verb usually comes before the particle:

• du går ind
• han kommer ud

So går ind is completely normal.

Because før du går ind i salen is a subordinate clause.

In Danish:

• In a main clause, you often get verb-second word order.
• In a subordinate clause, the word order is usually more straightforward: subject + verb.

So:

• Du går ind i salen. = You go into the hall.
• før du går ind i salen = before you go into the hall

That is why it is du går, not går du.

Salen means the hall, the room, or the auditorium, depending on context.

Again, this is the noun with the definite ending:

• sal = hall / auditorium / large room
• salen = the hall / the auditorium

So Danish marks definiteness by attaching -en to the noun.

Because all three are common-gender singular nouns in the definite form.

• taske → tasken
• garderobe → garderoben
• sal → salen

For many Danish nouns, -en means the.

Very roughly:

• common gender singular definite often ends in -en
• neuter singular definite often ends in -et

So the ending is doing the job that the does in English.

Yes, absolutely.

• Læg tasken i garderoben = Put the bag in the cloakroom.
• Læg din taske i garderoben = Put your bag in the cloakroom.

The version with din taske is more explicitly your bag.
The version with tasken often sounds natural when it is already obvious whose bag is being discussed.

Danish often uses the definite form where English might prefer a possessive, especially when the context makes ownership clear.

Yes, lægge is the natural verb here.

Danish often distinguishes placement verbs more than English does:

• lægge = lay/put something in a horizontal position
• stille = place/set something standing upright
• sætte = set/place something in a sitting position, or put someone/something onto a seat/surface in certain contexts

With a bag, lægge is very common and natural, especially when you are just telling someone to place it somewhere.

So:

• Læg tasken i garderoben sounds completely normal.

It is neutral and natural. It is not especially formal.

The use of du shows the normal singular you. Danish usually uses du in most everyday situations, even where some languages would use a more formal form.

The sentence could appear:

• on a sign
• as an instruction from staff
• in spoken conversation

So it is best understood as a straightforward instruction.

Yes, a few things may sound less clear than the spelling suggests.

For example:

• læg may sound a bit like lai / laj to English ears, depending on accent
• tasken often has a softer, reduced ending
• garderoben may have reduced vowels in normal speech
• går ind may flow together in connected speech
• salen will usually have a fairly soft final syllable

This is very common in Danish: the written form is often clearer than the fully natural spoken form. So if you do not hear every sound exactly as written, that is normal.