זה מושג חשוב.

Because in Hebrew, the verb to be is usually omitted in the present tense in sentences like this.

So:

זה מושג חשוב
literally looks like this / concept / important

but it naturally means:

This is an important concept.

If you change to past or future, Hebrew does use a form of to be, for example:

זה היה מושג חשוב = This was an important concept
זה יהיה מושג חשוב = This will be an important concept

Here, זה means something like this or this is at the start of the sentence.

In sentences of this type, זה often introduces or identifies something:

זה ספר = This is a book
זה רעיון טוב = This is a good idea

Depending on context, English might translate it as this or sometimes it, but the basic Hebrew word is still זה.

Because in Hebrew, adjectives usually come after the noun.

So:

מושג חשוב = an important concept
literally: concept important

This is normal Hebrew word order. A few more examples:

ילד טוב = a good boy
ספר מעניין = an interesting book

So if you are translating from English, remember that Hebrew usually puts the adjective after the noun.

Because חשוב is the masculine singular form of the adjective important, and it has to agree with מושג, which is also masculine singular.

Hebrew adjectives agree with the noun in gender and number.

Here:

• מושג = masculine singular
• חשוב = masculine singular

Other forms would be:

• חשובה = feminine singular
• חשובים = masculine plural
• חשובות = feminine plural

For example:

נקודה חשובה = an important point
מושגים חשובים = important concepts

Because מושג here is indefinite.

מושג חשוב means an important concept, not the important concept.

If you wanted to say the important concept, you would normally say:

המושג החשוב

Notice that in Hebrew, when a noun + adjective phrase is definite, both the noun and the adjective usually take ה־:

• מושג חשוב = an important concept
• המושג החשוב = the important concept

A common pronunciation is:

ze mu-SAG kha-SHUV

With stress on the last syllable of both מושג and חשוב.

A fuller guide:

• זה = ze
• מושג = mu-SAG
• חשוב = kha-SHUV or cha-SHUV

The ח sound is a throaty sound, like the ch in German Bach or Scottish loch. If you cannot say it yet, many learners use a softer h-like sound at first.

They are similar, but not the same.

זה מושג חשוב = This is an important concept.
This sentence identifies something as belonging to a category.

המושג הזה חשוב = This concept is important.
This sentence talks about a specific concept and says something about it.

So:

• זה מושג חשוב = identification
• המושג הזה חשוב = description of a specific item

This is a very useful distinction in Hebrew.

Yes. מושג can mean concept, notion, or sometimes term, depending on context.

For example:

• in philosophy or abstract discussion, it often means concept
• in a classroom or technical context, it may mean term or idea/notion

So even if the sentence is translated as This is an important concept, the noun itself has a slightly broader range.

Yes. זהו מושג חשוב is also correct.

The word זהו is a slightly more formal or emphatic version in this kind of sentence. In many cases:

זה מושג חשוב
and
זהו מושג חשוב

mean basically the same thing: This is an important concept.

In everyday speech, זה מושג חשוב is very natural.
In writing or more careful speech, זהו מושג חשוב may sound a bit more polished.

Yes. You can say:

זה מושג חשוב מאוד = This is a very important concept.

In Hebrew, מאוד usually comes after the adjective:

• חשוב מאוד = very important
• גדול מאוד = very big
• מעניין מאוד = very interesting

So the order is:

noun + adjective + מאוד

Yes, it is completely natural and normal.

It is a simple, useful sentence pattern:

זה + noun + adjective

Examples:

זה רעיון טוב = This is a good idea
זה נושא מעניין = This is an interesting topic
זה ספר חשוב = This is an important book

So זה מושג חשוב is a very standard Hebrew sentence structure.