A edição começa com a gravação.

Because both nouns are feminine singular nouns, and Portuguese often uses the definite article where English might not.

• a edição = the editing / the editing process
• a gravação = the recording

In Portuguese, it is very normal to say A edição começa com a gravação, even if English might more naturally say Editing starts with recording or The editing starts with the recording depending on context.

Also, nouns ending in -ção are usually feminine, which is why both take a.

Here, edição most likely means editing or the editing process.

This word can also mean edition in other contexts, such as:

• a edição do livro = the edition of the book
• a nova edição da revista = the new issue/edition of the magazine

But in this sentence, because it is paired with gravação, the meaning is clearly about media production: editing.

Começa is the third-person singular present tense of começar, meaning to begin or to start.

The subject is a edição, which is singular, so the verb must also be singular:

• a edição começa = the editing begins

Some other forms are:

• eu começo = I begin
• você começa = you begin
• nós começamos = we begin

So começa is used because the subject is it: the editing.

Com usually means with.

In this sentence, começar com means to begin with or to start with:

• A edição começa com a gravação = The editing begins with the recording

So com is showing the first step or starting point.

Because after com, Portuguese needs a noun phrase, not an infinitive verb.

• gravar = to record
• gravação = recording / the act of recording

So:

• começa com a gravação = starts with the recording

If you used gravar, the structure would need to be different. For example:

• começa a gravar = starts recording

That means something different.
So here, gravação is correct because it names the stage or process.

It can mean both, depending on context.

It can refer to:

• the act/process of recording
• a recording as a finished audio or video product

In this sentence, it most naturally means the recording stage or the act of recording, because it is describing a sequence of steps.

The marks are important for pronunciation.

• edição and gravação have ã/o nasalization in -ão
• começa has ç, called cedilha

What they do:

• ã helps mark a nasal sound
• -ão is a very common ending in Portuguese and sounds roughly like a nasal ow/ng combination to English speakers
• ç makes the c sound like s, so começa is pronounced like ko-MEH-sa, not with a hard k sound before the a

Without these marks, the pronunciation would change or the spelling would be incorrect.

A rough Brazilian Portuguese pronunciation is:

ah eh-dee-SOWN ko-MEH-sah kohm ah grah-vah-SOWN

A few key points:

• edição → stress on the last syllable
• começa → stress on me
• gravação → stress on the last syllable
• the ending -ão is nasal, which is difficult at first for English speakers

A more syllable-based breakdown:

• A = ah
• edição = eh-di-SÃO
• começa = co-ME-ça
• com = cong / kohm with a nasal quality depending on accent
• a gravação = a gra-va-ÇÃO

Sometimes, yes, but it changes the style.

• A edição começa com a gravação = normal, complete sentence
• Edição começa com gravação = sounds more like a headline, note, outline, or very compressed style

In standard everyday speech and writing, keeping the articles is more natural here.

Because começar com is the natural way to say to begin with when you mean the first element in a sequence.

• começar com = to start with
• começar na = to begin in/at
• começar pela = to begin through/by means of or to start with in some contexts, but it has a slightly different feel

Examples:

• A aula começa com uma revisão = The class starts with a review
• O filme começa na escola = The movie begins at the school
• Vamos começar pela introdução = Let’s begin with the introduction

So in your sentence, com is the most straightforward choice.

Yes, very close.

The structure is:

• A edição = subject
• começa = verb
• com a gravação = prepositional phrase

So it is basically:

The editing starts with the recording

This is a standard and very natural Portuguese word order.

Yes. Nouns ending in -ção are generally feminine in Portuguese.

That is why you get:

• a edição
• a gravação
• a informação
• a situação

This is a very useful pattern to remember. If you see a noun ending in -ção, it will very often take a, not o.

Yes. Edição is a broad word and can refer to many kinds of editing depending on context, including:

• video editing
• audio editing
• text editing
• image editing

The rest of the sentence helps narrow the meaning. Since it mentions gravação, the sentence suggests a production workflow, such as audio or video production.