Lidt ros er rart, men god kritik kan også være nyttig, især hvis en påmindelse eller en notifikation kommer for sent.

Because ros is being used as an uncountable abstract noun here, like praise in English.

• lidt means a little / some
• ros means praise
• So lidt ros = a little praise / some praise

You do not say en ros here, because the sentence is not talking about one praise as a countable item. Danish often leaves out the article with abstract or mass nouns in this kind of general statement.

This is a very common point of confusion.

Here, rart is the neuter singular form of rar. In sentences like this, Danish often uses the neuter form when it is evaluating a general idea, situation, or amount, not a clearly specific countable thing.

So Lidt ros er rart is very close in feeling to:

• Det er rart med lidt ros = It is nice with a little praise

In other words, the sentence is really judging the whole situation getting a little praise, so rart sounds natural.

This is why you should not try to match it too mechanically with the gender of ros.

Because kritik here is also being used in a general, abstract, uncountable sense.

So:

• god kritik = good criticism / good feedback
• en god kritik would more likely sound like a good critique/review, meaning one specific piece of criticism

In this sentence, the speaker means criticism in general, so the bare noun is the natural choice.

Because the two adjectives are doing two different jobs.

• god is an attributive adjective: it comes before the noun
  
  • god kritik
• nyttig is a predicative adjective: it comes after være
  
  • kritik kan være nyttig

Both forms are singular and fit kritik.

A useful contrast is this:

• god kritik = good criticism
• kritik ... være nyttig = criticism ... be useful

So the difference is not about meaning alone; it is also about position in the sentence.

Because Danish main clauses normally follow the V2 rule: the finite verb comes in second position.

Here the structure is:

• god kritik = subject
• kan = finite verb
• også = adverb
• være = infinitive

So:

• God kritik kan også være nyttig

is the normal Danish word order.

English often allows the adverb to move around more freely, but Danish is stricter here.

Using kan adds the idea of possibility or potential:

• er nyttig = is useful
• kan være nyttig = can be useful / may be useful

So the sentence is slightly softer and more nuanced. It does not say that criticism is always useful in every case, only that it can be.

Also, after a modal verb like kan, Danish uses the infinitive:

• kan være
• kan komme
• kan hjælpe

not a second finite verb.

især means especially, and hvis means if.

So:

• især hvis ... = especially if ...

It introduces a condition that makes the previous statement even more true:

• good criticism can also be useful,
• especially if a reminder or notification arrives too late.

Because these are two separate singular countable nouns, and each one normally needs its own indefinite article.

So Danish naturally says:

• en påmindelse eller en notifikation

rather than treating them as if one article covered both.

Repeating en makes it clear that either of the two things could be the one that arrives late.

This is a subordinate clause introduced by hvis.

In Danish subordinate clauses, the word order is usually more straightforward than in main clauses:

• hvis
• en påmindelse eller en notifikation = subject
• kommer = verb
• for sent = adverbial phrase

So:

• hvis en påmindelse eller en notifikation kommer for sent

has normal subject + verb order after hvis.

That is different from Danish main-clause V2 word order.

Literally, it is:

• kommer = comes / arrives
• for sent = too late

So kommer for sent means arrives too late.

It is written as two words because:

• for is the adverb too
• sent is late

This is a very common expression in Danish:

• Jeg kom for sent. = I arrived too late / I was late.

Yes, there is a small nuance.

• påmindelse is reminder
• notifikation is notification

In modern Danish, notifikation is very common in digital or app-related contexts, while påmindelse can sound a bit broader and more like something specifically meant to remind you of something.

So using both words in the same sentence sounds natural if the speaker wants to cover both possibilities:

• a reminder
• or a notification

They are both standard Danish words.