O manual de português está na mesa, ao lado do estojo azul.

Portuguese uses definite articles more often than English. So O manual is simply the manual.

It also shows the noun’s grammatical gender. Here:

• manual is masculine, so it takes o
• mesa is feminine, so it takes a
• estojo is masculine, so it takes o

A useful habit is to learn nouns together with their article: o manual, a mesa, o estojo.

In Portugal, manual often means a school textbook. So manual de português very often means Portuguese textbook, especially in a school context.

It can also mean manual/handbook in other contexts, but for classroom vocabulary, textbook is a very common interpretation.

After nouns like manual, Portuguese often uses de + subject/language with no article when speaking generally:

• manual de português
• livro de história
• professor de inglês

Here português names the subject or language in a general sense. Using do português would usually sound more specific, as if you were referring to a particular kind of Portuguese already identified by context.

Portuguese normally uses estar for location.

So:

• O manual está na mesa = the manual is on the table

By contrast, ser is normally used for identity, definition, or more permanent characteristics:

• O manual é novo = the manual is new
• A mesa é redonda = the table is round

So if you are saying where something is, estar is the usual verb.

Na is a contraction of em + a.

• em = in / on / at, depending on context
• a = the, feminine singular

So:

• em + a mesa → na mesa

Even though English says on the table, Portuguese uses em here. This is very normal. Portuguese em often covers location ideas that English splits into in, on, and sometimes at.

Ao lado de is a fixed expression meaning next to or beside. It is best learned as one chunk.

In this sentence:

• ao = a + o
• do = de + o

So ao lado do estojo azul means next to the blue pencil case/case.

If the next noun were feminine, you would get ao lado da...

In Portuguese, adjectives usually come after the noun, so estojo azul is the normal order.

Also, azul does not change for masculine vs feminine in the singular:

• o estojo azul
• a pasta azul

But it does change in the plural:

• os estojos azuis
• as pastas azuis

So in this sentence, azul stays azul because the noun is singular.

In Portuguese, names of languages and nationalities are usually not capitalized.

So Portuguese writes:

• português
• inglês
• francês

where English writes:

• Portuguese
• English
• French

The accent in português is also part of the correct spelling and helps show the stressed syllable.

Not necessarily. The sentence can often appear with or without the comma.

Here, the comma makes ao lado do estojo azul sound a bit more like extra added information about location. Without the comma, the sentence is still natural, but the flow is slightly tighter.

So this comma is mostly about rhythm and clarity, not a major change in meaning.