Я везу торт на праздник.

Везу comes from везти, which means to transport / to take by vehicle.

So this sentence suggests that the speaker is taking the cake by some kind of transport: for example, by car, taxi, bus, bicycle, or even in a stroller/cart.

This is different from:

• несу = I am carrying it in my hands
• иду = I am going / walking
• еду = I am going / riding myself, without focusing on carrying something

So Я везу торт specifically highlights that the cake is being taken somewhere by transport.

Везу is the 1st person singular form, so it means I am transporting / I am taking.

The infinitive is везти.

A few forms:

• я везу = I am taking
• ты везёшь = you are taking
• он / она везёт = he / she is taking
• мы везём = we are taking
• вы везёте = you are taking
• они везут = they are taking

Notice that везти is an irregular-looking verb, so learners usually just memorize the present-tense forms.

Here торт is the direct object of the verb, so it is in the accusative case.

For an inanimate masculine noun like торт, the accusative singular is the same as the nominative singular:

• nominative: торт
• accusative: торт

So the form does not change.

If the noun were feminine, you would often see a visible change. For example:

• Я везу книгу. = I am taking a book.

На праздник means to the celebration / for the celebration / to the holiday event.

The preposition на is often used with events, activities, and destinations understood as occasions:

• на концерт = to a concert
• на свадьбу = to a wedding
• на работу = to work
• на праздник = to a celebration/holiday event

So Я везу торт на праздник means the cake is being taken to that event.

Because after на expressing motion toward a destination, Russian uses the accusative case.

Compare:

• на праздник = to the celebration → motion, accusative
• на празднике = at the celebration → location, prepositional

So in this sentence:

• на праздник = destination
• therefore праздник is accusative

For this noun, again, the accusative looks the same as the nominative because it is inanimate masculine singular.

Yes. Russian often omits subject pronouns when the verb already makes the subject clear.

So both of these are natural:

• Я везу торт на праздник.
• Везу торт на праздник.

The version with Я sounds a bit more explicit or contrastive, for example if you want to stress I’m the one taking it.

This is a very common question.

Both can relate to transporting something, but they are used differently:

• везти = taking/carrying something in one specific direction, one trip, right now or as a single action
• возить = taking/carrying something regularly, repeatedly, or in various directions

So:

• Я везу торт на праздник. = I’m taking the cake to the celebration.
  One concrete trip.

Compare:

• Я обычно вожу детей в школу. = I usually drive the children to school.
  Repeated/habitual action.

So in your sentence, везу is the right choice because it describes one specific trip with the cake.

Везу is from the imperfective verb везти.

Here that means the action is presented as:

• ongoing,
• in progress,
• or simply as a fact without emphasizing completion.

So the sentence focuses on the process: I am taking the cake to the celebration.

If you wanted to emphasize successful completion, Russian would normally use a perfective verb in a past or future context, not this present-tense form.

Yes. Russian word order is flexible.

The neutral order here is:

• Я везу торт на праздник.

But other orders are possible depending on emphasis:

• Торт я везу на праздник. = It’s the cake that I’m taking to the celebration.
• На праздник я везу торт. = To the celebration, I’m taking a cake.
• Я на праздник везу торт. = I’m taking a cake to the celebration.

The basic meaning stays the same, but the emphasis shifts.

A helpful pronunciation guide is:

• Я = ya
• везу = vee-ZOO
• торт = tort
• на = na
• праздник = PRAHZ-neek

Stress:

• везу́
• то́рт
• пра́здник

One tricky word is праздник. In normal speech, the д is often not clearly pronounced, so it may sound close to празник.

Russian does not have articles like a/an or the.

So торт can mean:

• a cake
• the cake

The exact meaning depends on context.

The same is true for праздник:

• a celebration
• the celebration / the holiday

Russian leaves this to context instead of using articles.