À la maison, j’enfile mes chaussons, tandis que Marie met ses bottines pour sortir.

Yes. À la maison means at home or in the house / at the house, depending on context.

In this sentence, it sets the scene first: At home, I put on my slippers...

French often places a time or place expression at the beginning of the sentence for context. You could also say:

J’enfile mes chaussons à la maison...

But starting with À la maison sounds very natural.

Because je becomes j’ before a vowel sound.

• je enfile → not allowed
• j’enfile → correct

This is called elision. It happens very often in French:

• j’aime
• j’habite
• j’écoute

So j’enfile simply means I put on / slip on.

In this sentence, enfiler means to slip on or to put on, especially something like shoes, clothes, or gloves.

So:

• j’enfile mes chaussons = I slip on my slippers
• Marie met ses bottines = Marie puts on her ankle boots

The difference is mostly one of nuance:

• mettre is the general verb: to put on
• enfiler often suggests putting something on by sliding into it, like shoes, sleeves, gloves, etc.

Both are natural here, but enfiler sounds a bit more specific and vivid for slippers.

French usually uses a possessive adjective where English might simply use the, especially with clothing, body parts, and personal items.

So French prefers:

• mes chaussons = my slippers
• ses bottines = her boots / his boots

Even if English might sometimes say I put on the slippers, French often still says my slippers if they belong to the speaker.

Also remember:

• mes agrees with the thing owned: plural
• ses also agrees with the thing owned: plural

It does not tell you the gender of the owner. ses bottines can mean:

• her ankle boots
• his ankle boots

In this sentence, we know it is Marie’s, so in English it would be her ankle boots.

Chaussons are slippers or soft indoor footwear.

Depending on context, un chausson can also mean other things in French, but here mes chaussons clearly means my slippers, especially because the sentence begins with À la maison.

Bottines are usually ankle boots or short boots.

They are shorter than full bottes. So:

• bottes = boots
• bottines = ankle boots / booties

In this sentence, Marie met ses bottines pour sortir suggests she is putting on outdoor footwear before going out.

Tandis que means while, whereas, or at the same time that, depending on context.

Here it connects two actions:

• I put on my slippers
• Marie puts on her ankle boots to go out

So it shows a contrast or simultaneous comparison:

• I’m getting comfortable at home
• Marie is getting ready to leave

That contrast is an important part of the sentence.

Other possible translations in context:

• while
• whereas

Not exactly.

Both can mean while, but they are used a little differently:

• pendant que mainly emphasizes that two actions happen at the same time
• tandis que can also do that, but it often adds a sense of contrast

In this sentence, tandis que works well because the two actions contrast:

• slippers / staying in
• boots / going out

So tandis que is a very natural choice here.

After pour to express purpose—in other words, in order to—French uses the infinitive.

So:

• pour sortir = to go out / in order to go out

This is the normal structure:

• Je viens pour aider = I’m coming to help
• Il part pour travailler = He leaves to work
• Marie met ses bottines pour sortir = Marie puts on her ankle boots to go out

Also, sortir already means to go out, so adding dehors is usually unnecessary here.

Because sortir is a verb here, not a noun.

In pour sortir, sortir is in the infinitive form and means to go out.

Compare:

• pour sortir = to go out
• la sortie = the exit / the outing / the way out

French does not use an article before an infinitive in this kind of structure.

Because the subject is Marie, which is third person singular.

The verb is mettre in the present tense:

• je mets = I put on
• tu mets = you put on
• il / elle / on met = he / she / one puts on

So:

• Marie met = Marie puts on

Even though mets and met sound the same in speech, the spelling changes depending on the subject.

The first comma separates the opening context phrase:

• À la maison, ...

This is very common in French and English.

The comma before tandis que separates the two parts of the sentence:

• j’enfile mes chaussons
• tandis que Marie met ses bottines pour sortir

It helps readability and reflects the structure clearly. In a sentence like this, the punctuation is natural and standard.

Yes. The original sentence is already natural, but here are a few everyday alternatives:

• À la maison, je mets mes chaussons, tandis que Marie met ses bottines pour sortir.
• À la maison, j’enfile mes chaussons, alors que Marie met ses bottines pour sortir.
• Moi, à la maison, je mets mes chaussons, et Marie met ses bottines pour sortir.

The original version is slightly more polished because of enfiler and tandis que, but it is still perfectly normal French.

Yes, most likely. It presents two actions in parallel:

• I put on my slippers at home
• Marie puts on her ankle boots to go out

Using tandis que suggests the two actions are happening at the same time or are being compared side by side.

It also highlights a contrast in situation:

• one person is settling in indoors
• the other is getting ready to leave

That contrast is part of what makes the sentence expressive.