طبعا التأمين مهم.

طبعا means of course, naturally, or obviously, depending on tone.

In Levantine, it is extremely common in everyday speech and sounds very natural. It is not overly formal, but it is also not slang, so you will hear it in many situations.

It comes from طبعًا in more formal spelling, but in normal writing people often write طبعا without the extra diacritic.

Arabic usually leaves out the verb to be in the present tense.

So:

• التأمين مهم = Insurance is important

There is no separate word for is here. This is called a nominal sentence.

If you wanted past or future, then Arabic would use a verb:

• كان التأمين مهم = Insurance was important
• رح يكون التأمين مهم = Insurance will be important

But in the present, no is is needed.

In Arabic, general ideas are often expressed with the definite article الـ even when English uses no article.

So التأمين here does not necessarily mean one specific insurance policy. It can mean insurance as a general concept.

This is very normal in Arabic. Compare:

• الوقت مهم = Time is important
• الصحة مهمة = Health is important
• التأمين مهم = Insurance is important

So the الـ here is not strange; it often makes a noun sound like a general category.

It is commonly pronounced something like et-ta2miin or it-ta2miin.

A few useful points:

• The ت is a sun letter
• Because of that, the ل in الـ is not pronounced clearly
• So ال + تأمين sounds like اتّأمين / التأمين, with the t doubled in pronunciation

That is why learners often hear:

• written: التأمين
• pronounced: et-ta2miin

The 2 in transliteration represents the hamza sound, a little catch in the throat.

Here, التأمين means insurance.

In everyday Levantine, it can refer to things like:

• health insurance
• car insurance
• travel insurance
• insurance in general

The word comes from a root related to safety and security, so in some contexts it can also connect to the idea of securing or providing protection, but in this sentence the normal meaning is simply insurance.

Because التأمين is grammatically masculine singular, the adjective must match it.

So:

• التأمين مهم
• not التأمين مهمة

In Arabic, adjectives agree with the nouns they describe in gender and number.

For comparison:

• الخطة مهمة = The plan is important
  because الخطة is feminine
• التأمين مهم = Insurance is important
  because التأمين is masculine

This is grammatical gender, not real-world gender.

In careful pronunciation, it is close to muhimm.

In Levantine speech, it is often heard more like mhemm.

Two things matter here:

• the م is doubled in effect because of the shadda
• the word is often shortened rhythmically in spoken dialect

So if you hear mhemm, that is normal Levantine pronunciation of مهم.

It works in both, which is one reason it is a useful sentence.

• طبعا is very common in spoken Levantine
• التأمين مهم is also perfectly understandable in Standard Arabic

So this sentence feels natural in Levantine, but it is not so dialect-specific that it would sound wrong in formal Arabic.

The biggest difference is usually in pronunciation, not in the basic grammar here.

Yes. Arabic has some flexibility here.

These are all possible, with slightly different emphasis:

• طبعا التأمين مهم = Of course, insurance is important
• التأمين مهم طبعا = Insurance is important, of course
• التأمين طبعا مهم = Insurance is of course important

Starting with طبعا sounds very natural if you are reacting to something someone said, or if you want to frame the whole statement as obvious.

Yes. A few common alternatives are:

• أكيد التأمين مهم = Insurance is definitely important
• التأمين ضروري = Insurance is necessary
• التأمين كتير مهم = Insurance is very important

These are similar, but not identical:

• طبعا gives the feeling of of course
• أكيد gives the feeling of definitely / certainly
• ضروري is stronger, more like necessary
• كتير مهم intensifies important

So طبعا التأمين مهم is natural, but not the only way to express the idea.