Olhe além da porta.

Olhe is the imperative form used with você in Brazilian Portuguese.

• Olhe além da porta. = Look beyond the door. (speaking to você)
• If you were using tu, the command would usually be Olha além da porta.

So the choice of olhe tells you the sentence is addressing someone with the você form, which is very common in Brazil.

No. Olhe can also be the present subjunctive form of olhar.

For example:

• Espero que você olhe além da porta. = I hope you look beyond the door.

In your sentence, though, Olhe além da porta., it is clearly being used as a command: Look beyond the door.

Além means beyond or further than.

In this sentence, além da porta means beyond the door or on the other side of the door.

A very common pattern is:

• além de = beyond / besides / in addition to, depending on context

Here it is being used in the physical sense: beyond the door.

Because além is followed by de, and de + a contracts to da.

So:

• além de a porta → além da porta

This kind of contraction is extremely common in Portuguese:

• de + o = do
• de + a = da
• de + os = dos
• de + as = das

So além da porta is the normal, correct form.

Portuguese uses definite articles more often than English does.

In English, you say beyond the door. Portuguese also normally uses the article here:

• a porta = the door
• da porta = of/from the door after contraction

Saying além de porta would sound incomplete or unnatural in this context.

Here, olhar means to look.

A helpful basic distinction is:

• olhar = to look
• ver = to see
• assistir = to watch (for TV, movies, games, etc.)

So:

• Olhe além da porta. = Look beyond the door.
• not See beyond the door

Of course, real usage can overlap a little, but for this sentence, look is the best match.

Yes. It can be literal or figurative.

Literal:

• Look past the door / to the other side of the door.

Figurative:

• Look beyond the obvious.
• Think past the barrier in front of you.

Portuguese often uses além de and além in both physical and metaphorical ways, just like English uses beyond.

No. They are different.

• além da porta = beyond the door / past the door
• atrás da porta = behind the door

So if you mean something hidden right behind the door, use atrás da porta. If you mean something on the other side or further past it, use além da porta.

Yes, you could, and it can sound a bit more explicit.

• Olhe além da porta.
• Olhe para além da porta.

Both are understandable. The version without para is concise and natural. Adding para can make the directional idea a little clearer, similar to look out beyond the door.

In many everyday situations, Olhe além da porta is perfectly fine.

Yes. It is very natural for a command.

Portuguese commonly puts the imperative verb first:

• Olhe além da porta.
• Veja isso.
• Escute com atenção.

Starting with the verb makes it sound like a direct instruction, just as in English: Look beyond the door.

A rough English-friendly guide would be:

• OL-yee ah-LENG da POR-ta

A few notes:

• lh in olhe sounds like the lli in million for many English speakers
• além has stress on the second syllable
• the m at the end of além nasalizes the vowel rather than being strongly pronounced
• porta in Brazilian Portuguese usually has a tapped or lightly guttural r, depending on accent

A more approximate IPA version is:

• /ˈɔ.ʎi aˈlẽj̃ dɐ ˈpɔʁ.tɐ/

Yes. Portuguese often leaves the subject unstated when it is understood from the verb form.

So:

• Olhe além da porta.

already implies:

• Você, olhe além da porta.

Including você is possible, but usually unnecessary unless you want emphasis:

• Você, olhe além da porta.

That sounds more pointed or emphatic.