Después de haber preparado la cena, me siento tranquilo.

Both are possible, but después de haber preparado is a bit more explicit about the action being completed before the speaker feels calm.

• después de preparar la cena = after preparing dinner
• después de haber preparado la cena = after having prepared dinner

In everyday Spanish, many speakers would simply say Después de preparar la cena, me siento tranquilo. Using haber + past participle sounds a little more formal or more precise about the earlier action being finished.

It is the infinitive perfect in Spanish.

Structure:

• haber
  • past participle
• haber preparado = to have prepared

This form is used when you want to refer to an action that happened before another action, without using a fully conjugated verb.

Here, the sequence is:

1. first: haber preparado la cena
2. then: me siento tranquilo

So the sentence marks one action as completed before the feeling happens.

Because después normally takes de when it is followed by a noun, infinitive, or infinitive phrase.

Examples:

• después de la cena
• después de comer
• después de haber preparado la cena

You only get a different structure when a full clause follows, for example:

• después de que preparé la cena

So in your sentence, de is required.

Because preparado is a past participle used with haber, and with haber, the participle does not agree in gender or number with the object.

So you say:

• haber preparado la cena
• haber hecho las tareas
• haber comprado las verduras

The participle stays the same.

Agreement happens in other situations, such as with adjectives:

• La cena está preparada

There, preparada describes la cena, so it agrees with it.

Spanish often uses sentirse to talk about how someone feels emotionally or physically.

• me siento tranquilo = I feel calm
• estoy tranquilo = I am calm

Both can be correct, but they are not always identical in tone.

• sentirse focuses more directly on the inner feeling
• estar states the state or condition

In this sentence, me siento tranquilo sounds very natural because the speaker is describing their emotional state after finishing dinner preparation.

It is the reflexive pronoun that goes with the verb sentirse.

The verb is learned as:

• sentirse = to feel

Its forms are:

• me siento
• te sientes
• se siente
• nos sentimos
• os sentís
• se sienten

So me siento tranquilo literally works like I feel myself calm, although you should think of it simply as I feel calm.

Be careful: siento without me usually means I feel something external, or I am sorry, depending on context:

• Siento frío = I feel cold
• Lo siento = I’m sorry

But for emotional states like this, me siento tranquilo is the standard pattern.

Because tranquilo is an adjective describing the speaker, and adjectives must agree with the person they describe.

If the speaker is male, you say:

• me siento tranquilo

If the speaker is female, you say:

• me siento tranquila

If the speaker is talking about a group, it changes too:

• nos sentimos tranquilos
• nos sentimos tranquilas

So the ending depends on who is speaking, not on la cena.

Yes, that is also correct.

Compare the two:

• Después de haber preparado la cena, me siento tranquilo.
• Después de que preparé la cena, me siento tranquilo.

The second version uses a full clause with a conjugated verb (preparé). It is perfectly natural.

The first version is a bit more compact and slightly more formal or more written in style. The second can feel more direct and conversational.

Yes. That word order is completely natural.

Both are correct:

• Después de haber preparado la cena, me siento tranquilo.
• Me siento tranquilo después de haber preparado la cena.

The difference is mostly about emphasis:

• Starting with Después de haber preparado la cena highlights the completed action first.
• Starting with Me siento tranquilo highlights the feeling first.

When the sentence begins with a longer introductory phrase like Después de haber preparado la cena, the comma is very natural and strongly preferred in writing:

• Después de haber preparado la cena, me siento tranquilo.

If the time phrase comes at the end, there is no comma:

• Me siento tranquilo después de haber preparado la cena.

So the comma helps separate the opening phrase from the main clause.

Yes. Adding ya can make the idea of completion clearer.

For example:

• Después de haber preparado la cena, ya me siento tranquilo.

Here, ya suggests something like now / at this point / finally. It gives a stronger feeling that the speaker has reached a calm state after finishing the task.

Without ya, the sentence is still completely natural.