Opće znanje je važno.

Because znanje is a neuter singular noun, and the adjective has to agree with it in gender, number, and case.

• opći = masculine singular
• opća = feminine singular
• opće = neuter singular

So:

• opći čovjek = a general man/person
• opća tema = a general topic
• opće znanje = general knowledge

In this sentence, both opće and važno are neuter singular because they refer to znanje.

It is in the nominative singular.

This sentence is a simple statement of the type X is Y, so the subject is in the nominative:

• Opće znanje = the subject
• je = is
• važno = the predicate adjective

So znanje appears in its basic dictionary form here.

Je is the 3rd person singular present tense of the verb biti (to be).

So:

• ja sam = I am
• ti si = you are
• on/ona/ono je = he/she/it is

Since opće znanje is grammatically singular, Croatian uses je.

For the same reason as opće: it agrees with znanje, which is neuter singular.

Forms of important are:

• važan = masculine singular
• važna = feminine singular
• važno = neuter singular

Because znanje is neuter, Croatian says važno.

Yes, znanje is a neuter noun. A strong clue is its ending: many Croatian neuter nouns end in -e or -o.

Examples:

• more = sea
• vrijeme = time/weather
• pismo = letter
• znanje = knowledge

A lot of nouns ending in -nje are neuter as well, especially verbal nouns like:

• učenje = learning
• pitanje = question
• mišljenje = opinion/thought
• znanje = knowledge

A rough pronunciation is OP-che.

A few helpful points:

• ć is a soft sound, somewhat like a very soft ch
• opće is commonly pronounced close to op-che
• the e at the end is clearly pronounced, not silent

So the whole phrase opće znanje is roughly:

OP-che ZNA-nye

And znanje has the nj sound, similar to the ny in canyon.

They are related, but they do different jobs.

• opće is an adjective: general
• općenito is usually an adverb: generally, in general

So:

• opće znanje = general knowledge
• Općenito, to je dobro. = Generally, that is good.

You use opće directly with a noun, while općenito usually modifies a whole statement or verb.

Yes. Znanje je važno is a perfectly correct sentence.

The difference is:

• Znanje je važno. = Knowledge is important.
• Opće znanje je važno. = General knowledge is important.

So opće narrows the meaning.

Yes, Croatian word order is more flexible than English word order.

The neutral, most straightforward order is:

• Opće znanje je važno.

But depending on emphasis, you might also see:

• Važno je opće znanje.

This version can sound more like General knowledge is what is important or put extra focus on važno.

In normal learning contexts, Opće znanje je važno is the best version to remember first.

No. Croatian does not have articles like a/an/the.

So opće znanje can mean:

• general knowledge
• the general knowledge

The exact interpretation depends on context. In this sentence, English usually translates it naturally without an article or with the most natural article choice for the context.

Yes, it is a very common and natural expression meaning general knowledge in the broad sense of basic awareness of many topics.

You will often hear it in contexts like:

• school
• quizzes
• education
• being well-informed

So it is worth learning as a chunk: opće znanje.

In Croatian, the adjective after je still agrees with the subject.

So in:

• Opće znanje je važno.

the adjective važno matches znanje in gender and number.

This is normal in Croatian with predicate adjectives:

• Čovjek je važan. = The man is important.
• Tema je važna. = The topic is important.
• Znanje je važno. = Knowledge is important.

So you do not need a separate special form here; you just use the agreeing adjective.

Sometimes words related to opći/opće can overlap with ideas like general, common, or overall, depending on context. But in opće znanje, the natural meaning is definitely general knowledge, not universal knowledge.

So for this sentence, the learner should understand opće znanje as the standard phrase general knowledge.