Siempre me pongo desodorante antes de salir de casa.

Because ponerse is very commonly used in Spanish for things you put on yourself or apply to yourself.

So:

• poner = to put
• ponerse = to put on oneself / to apply to oneself

In this sentence, me pongo desodorante literally works like I put deodorant on myself, though in natural English we usually just say I put on deodorant or I apply deodorant.

The reflexive pronoun changes with the person:

• me pongo = I put on
• te pones = you put on
• se pone = he/she puts on

So me is there because the action is being done to yourself.

Because poner is an irregular verb in the yo form of the present tense.

Present tense of poner:

• yo pongo
• tú pones
• él/ella pone
• nosotros ponemos
• vosotros ponéis
• ellos/ellas ponen

That -go form in yo is something you just have to learn. Other common verbs do this too, such as:

• hacer → hago
• salir → salgo
• tener → tengo

So me pongo is the correct I form.

Not exactly.

With clothes, ponerse often means to put on rather than to wear:

• Me pongo la chaqueta = I put on my jacket

For deodorant, it means to put on / apply deodorant.

If you wanted to wear in the sense of have something on, Spanish usually uses llevar:

• Llevo chaqueta = I’m wearing a jacket

So in this sentence, me pongo means I apply / put on, not I wear.

In Spanish, when talking about something in a general, non-specific way, it is often natural to leave out the article.

So:

• Me pongo desodorante = I put on deodorant

This sounds like a general habit, not a specific deodorant already identified in the conversation.

You could also hear:

• Me pongo el desodorante

That would sound more like the deodorant / my deodorant, referring to a specific item or the usual one in the situation.

Both are possible, but without the article is very natural when speaking generally about routine actions.

Because after a preposition like de, Spanish normally uses the infinitive, not a conjugated verb, when the subject stays the same.

So:

• antes de salir = before leaving / before I leave

Not:

• antes de salgo ❌

A good rule is:

• antes de + infinitive when the same person does both actions

Here, the same person both puts on deodorant and leaves, so Spanish uses the infinitive salir.

Because antes de + infinitive is the normal structure when the subject is the same.

• Siempre me pongo desodorante antes de salir de casa. = I always put on deodorant before leaving home.

You usually use antes de que + subjunctive when the following action has a different subject, or when Spanish treats it as a full clause:

• Me pongo desodorante antes de que él llegue. = I put on deodorant before he arrives.

So in your sentence, antes de salir is correct because it is I ... before I leave.

Because casa often means home in Spanish, and in that use it commonly appears without an article after some expressions.

So:

• salir de casa = to leave home
• estar en casa = to be at home
• volver a casa = to go back home

If you say la casa, that usually sounds more like the house/building as a physical object.

Compare:

• Salgo de casa = I leave home
• Salgo de la casa = I leave the house

Both are possible, but they are not exactly the same in feel. In your sentence, de casa is the natural idiomatic choice for from home.

Yes, you could, but it changes the nuance a little.

• de casa = from home
• de mi casa = from my house/home

De casa is more idiomatic and general. It sounds very natural when talking about your home as a normal everyday place.

De mi casa is more explicit and can sound a bit more contrastive or emphatic, for example if you want to stress that it is your house and not somewhere else.

So in a neutral sentence about routine, de casa is usually the best choice.

Because Spanish is flexible with word order, and putting siempre first is a very natural way to emphasize the habitual nature of the action.

• Siempre me pongo desodorante antes de salir de casa.
• Me pongo desodorante siempre antes de salir de casa.

Both are possible, but the first one is more natural and common for a simple statement like this.

Putting siempre first makes the sentence feel like:

• As a rule / always, I put on deodorant before leaving home.

Yes. In Spanish, just like in English, the present tense is often used for habitual actions.

So:

• Siempre me pongo desodorante... = I always put on deodorant...

This does not mean you are doing it right now. It means it is your usual routine.

Spanish uses the present tense very often for habits, routines, and general truths.

Not in this exact structure.

With a conjugated verb, the reflexive pronoun normally goes before it:

• me pongo ✅

Not:

• pongo me ❌

But pronouns can attach to:

• infinitives: voy a ponerme
• gerunds: estoy poniéndome
• affirmative commands: ponte

So in your sentence, because pongo is a normal conjugated present-tense form, me has to come before it: me pongo.

Yes. In Spain especially, echarse desodorante is also very natural.

For example:

• Siempre me echo desodorante antes de salir de casa.

This also means I always put on/apply deodorant before leaving home.

A few possibilities are:

• ponerse desodorante = to put on deodorant
• echarse desodorante = to put/spray deodorant on oneself
• aplicarse desodorante = to apply deodorant

Ponerse is very common and natural, especially in everyday speech.

You would usually use lo, because desodorante is masculine singular:

• Siempre me lo pongo antes de salir de casa. = I always put it on before leaving home.

Here:

• me = on myself
• lo = it (the deodorant)

So Spanish can stack both pronouns:

• me lo pongo

That is very common with verbs like poner.

Yes, desodorante is normally masculine:

• el desodorante

Even though it ends in -e, that is not unusual. Many masculine nouns end in -e.

Examples:

• el coche
• el aceite
• el desodorante

So if you use an article or adjective with it, you would normally make them masculine:

• el desodorante
• un desodorante bueno