A beleza é importante.

In this sentence, a means the, not a/an.

Portuguese has:

• o / a = the
• um / uma = a/an

So:

• a beleza = beauty or the beauty

With abstract nouns like beleza, Portuguese often uses the definite article where English may not:

• A beleza é importante. = Beauty is important.

English usually drops the in a general statement like this, but Portuguese normally keeps it.

Beleza is a feminine noun in Portuguese, so it takes the feminine article a.

That is why you get:

• a beleza

Many nouns ending in -eza are feminine, such as:

• a pobreza = poverty
• a riqueza = wealth
• a natureza = nature

Grammatical gender in Portuguese is a property of the noun itself. It does not mean that beauty is biologically female; it just means the word is grammatically feminine.

É means is.

It is the he/she/it and you (formal) form of the verb ser:

• ser = to be
• é = is

So:

• A beleza é importante. literally = The beauty is important.

In natural English, this becomes:

• Beauty is important.

The accent shows both pronunciation and helps distinguish the word.

• é = is
• e = and

So the accent is important because it changes the word:

• é = verb form of ser
• e = conjunction meaning and

In pronunciation, é has an open vowel sound.

Actually, importante already matches just fine. It is an adjective with the same form for masculine and feminine singular.

So you can say:

• o livro é importante = the book is important
• a beleza é importante = beauty is important

But in the plural, it changes:

• os livros são importantes
• as ideias são importantes

So importante is:

• singular: importante
• plural: importantes

In standard Portuguese, especially in a neutral general statement, A beleza é importante is the most natural form.

Dropping the article and saying Beleza é importante sounds less standard and can feel abrupt or unusual in this context.

European Portuguese usually prefers the article with abstract nouns in general statements like this.

A careful pronunciation would be approximately:

a beh-LEH-zah eh im-por-TAHN-tuh

A few useful notes for European Portuguese:

• beleza sounds roughly like buh-LEH-zuh
• é is a short open eh
• the final -e in importante is often a very reduced sound in European Portuguese, not a full English ee

A more natural European Portuguese rhythm may make some unstressed vowels sound weaker than you might expect from the spelling.

This is the normal and most neutral word order:

• A beleza = subject
• é = verb
• importante = adjective/complement

So:

• A beleza é importante.

You might sometimes see different word order for emphasis in more literary or rhetorical language, but for everyday learning, this is the standard pattern.

You add não before the verb:

• A beleza não é importante. = Beauty is not important.

That is the normal way to negate this kind of sentence in Portuguese.

No, not with the same meaning.

• importante = important
• bonita = beautiful / pretty

So:

• A beleza é importante. = Beauty is important.
• A beleza é bonita. would mean something like Beauty is beautiful, which is grammatically possible but sounds odd and repetitive.

If you want to say The beauty is beautiful, Portuguese would allow it grammatically, but it is not a natural equivalent of the original sentence.

They belong to different word classes:

• beleza = beauty (noun)
• bonito / bonita = beautiful / pretty (adjective)

In this sentence:

• beleza is the thing being talked about
• importante describes it

So the structure is:

• noun + verb + adjective
• A beleza é importante.

Compare:

• A beleza = beauty
• uma coisa bonita = a beautiful thing

Yes, literally it can.

Because a beleza can mean:

• beauty in general
• or the beauty, depending on context

Without more context, Portuguese often uses the article even when English would prefer a general meaning. So in most beginner contexts, this sentence is best understood as:

• Beauty is important.

But in a specific context, it could also mean:

• The beauty is important.

For example, if people are discussing several qualities of something, a beleza might refer to its beauty specifically.