Сегодня утром я купила круассан и кофе в новой булочной.

Because the verb is in the past tense, and in Russian past tense verbs agree with the gender of the subject in the singular.

• я купил = I bought (said by a man)
• я купила = I bought (said by a woman)

So this sentence tells you that the speaker is female.

Утром is the form commonly used to mean in the morning.

It is historically related to the instrumental case, and in modern Russian it functions like an adverbial time expression:

• утром = in the morning
• вечером = in the evening
• днём = during the day
• ночью = at night

So Сегодня утром means this morning / today in the morning, not just today, morning.

In Russian, Сегодня утром is the normal idiomatic way to say this morning.

Literally, the words are:

• сегодня = today
• утром = in the morning

Together, they naturally mean this morning in context. Russian often does not need a separate word like this where English does.

Because в here means in / at, showing location, and after в with location Russian uses the prepositional case.

The base noun is:

• булочная = bakery

In the prepositional singular, it becomes:

• в булочной = in/at the bakery

The adjective новой also has to match the noun in gender, number, and case:

• новая булочная = a new bakery
• в новой булочной = in/at a new bakery

So both words change because they are part of a prepositional phrase of location.

Because after в meaning in/at a place, Russian uses the prepositional case.

Compare:

• булочная = bakery (dictionary form, nominative)
• в булочной = in/at the bakery (prepositional)

This is a very common pattern:

• в школе = at school
• в магазине = in/at the store
• в булочной = in/at the bakery

They are the direct objects of купила, so they are in the accusative case. But for these nouns, the accusative looks the same as the basic dictionary form.

круассан

It is an inanimate masculine noun, and for inanimate masculine nouns, accusative singular = nominative singular:

• круассан = a croissant
• купила круассан = bought a croissant

кофе

Кофе is usually treated as a masculine noun, but it is also indeclinable, which means its form does not change:

• кофе = coffee
• купила кофе = bought coffee

So even though both words are objects, their forms stay the same here.

Russian has no articles, so there is no direct equivalent of a, an, or the.

That means:

• круассан can mean a croissant or the croissant
• кофе can mean coffee or the coffee
• в новой булочной can mean in a new bakery or at the new bakery

The exact meaning depends on context. In this sentence, English naturally uses a croissant, coffee, and a new bakery.

Yes, it can often be omitted.

Russian frequently leaves out subject pronouns when the subject is clear from the verb form or the context. So both of these are possible:

• Сегодня утром я купила круассан и кофе в новой булочной.
• Сегодня утром купила круассан и кофе в новой булочной.

The version with я is a bit more explicit. It may be used for clarity, emphasis, or just personal style.

Купить / купила is the perfective form, which presents the action as completed.

So купила means the speaker successfully bought the items as a finished event.

Compare:

• купила = bought, completed the purchase
• покупала = was buying / used to buy / bought (with focus on process, repetition, or background)

In this sentence, the idea is a single completed event this morning, so купила is the natural choice.

Yes. Russian word order is flexible, although different orders can change the focus or emphasis.

The given sentence is neutral and natural:

• Сегодня утром я купила круассан и кофе в новой булочной.

Other possible versions include:

• Я сегодня утром купила круассан и кофе в новой булочной.
• В новой булочной я сегодня утром купила круассан и кофе.
• Круассан и кофе я купила сегодня утром в новой булочной.

These all mean roughly the same thing, but the highlighted information shifts:

• starting with В новой булочной emphasizes where
• starting with Круассан и кофе emphasizes what
• starting with Я can emphasize who

Because in English, when talking about buying something from a business, we often say at:

• I bought it at the bakery
• I bought it at the store

Russian uses в with the place name:

• в булочной
• в магазине
• в кафе

Depending on context, в may be translated as in or at. Here, at the new bakery sounds more natural in English, even though the Russian preposition is в.

Because grammatical gender in Russian is not based only on the ending. Кофе is a well-known exception.

Even though it ends in -е, standard Russian traditionally treats кофе as masculine:

• горячий кофе = hot coffee
• вкусный кофе = tasty coffee

Also, it is usually indeclinable, so its form stays кофе in different cases.

For a learner, the important thing is simply to memorize кофе as an exception.

Not exactly, though they are similar.

• булочная traditionally means a bakery / bread shop, especially a place selling bread, pastries, and similar items.
• пекарня can mean a bakery too, but often refers more directly to a place where things are baked.

In everyday use, there can be overlap, and both may be translated as bakery in English. In this sentence, булочная suggests the speaker bought the croissant and coffee at a bakery-type shop.

Because the sentence is only describing the buying event, not the movement.

English might sometimes say:

• This morning I went to the new bakery and bought a croissant and coffee.

But Russian does not need to mention going unless that idea matters. Here, в новой булочной simply tells you where the buying happened:

• купила ... в новой булочной = bought ... at the new bakery

So the location is included, but the action of going there is left unstated.