Vi skal følge sorteringsguiden.

Skal is a modal verb. In this sentence, it expresses obligation or instruction:

• Vi skal følge sorteringsguiden = We must / have to / are supposed to follow the sorting guide

Danish skal can also sometimes refer to the future, but here the most natural reading is must / should according to a rule.

Because følge comes after the modal verb skal.

In Danish, after a modal verb like skal, kan, vil, or må, the next verb stays in the infinitive/base form:

• vi følger = we follow
• vi skal følge = we must follow

So følge is correct here.

After a modal verb in Danish, you normally do not use at.

Compare:

• at følge = to follow
• Vi prøver at følge guiden = We try to follow the guide
• Vi skal følge guiden = We must follow the guide

So with skal, the structure is simply skal + infinitive.

Because Danish very often forms compound nouns as one word.

Here, the word is built like this:

• sortering = sorting
• guide = guide
• sorteringsguide = sorting guide

This is extremely common in Danish. Where English often uses two words, Danish often prefers one compound word.

That -s- is a linking element used in many Danish compounds.

So:

• sortering + guide becomes sorteringsguide

It does not mean possession here. It is not like the English apostrophe in the company's guide. It is just a normal way of joining parts of a compound in Danish.

Not every compound uses -s-, but many do.

In Danish, the is often added to the end of the noun instead of being a separate word.

• en guide = a guide
• guiden = the guide

Because guide already ends in -e, Danish adds just -n, not -en again.

So:

• sorteringsguide = sorting guide
• sorteringsguiden = the sorting guide

In a compound, the definite ending is added to the last part of the word.

Because følge takes a direct object.

You follow something directly:

• følge guiden = follow the guide
• følge reglerne = follow the rules
• følge planen = follow the plan

So no extra preposition is needed.

Yes. This is a normal main-clause pattern:

• Vi = subject
• skal = finite verb
• følge = infinitive/main verb
• sorteringsguiden = object

So the sentence structure is:

subject + finite verb + infinitive + object

More generally, Danish main clauses usually keep the finite verb in second position. For example:

• I dag skal vi følge sorteringsguiden = Today we must follow the sorting guide

Notice that skal still comes early in the sentence.

Yes, but the meaning changes.

• Vi skal følge sorteringsguiden = We must / are supposed to follow the sorting guide
• Vi bør følge sorteringsguiden = We should follow the sorting guide
• Vi må følge sorteringsguiden can mean something like we may / are allowed to follow the sorting guide, and in some contexts we have to, so it can be less clear

If the sentence is giving a rule, instruction, or official requirement, skal is a very natural choice.