A képzés januárban lesz.

A is the definite article in Hungarian, like the in English.

So A képzés means the training or the course.

Hungarian uses definite articles very often, sometimes even where English might leave them out. So even if English says something like Training will be in January, Hungarian will often still use A if a specific training/course is meant.

Képzés usually means training, education, instruction, or sometimes course/program, depending on context.

In this sentence, it most naturally means something like:

• the training
• the course
• the program

So A képzés januárban lesz could be understood as The training will be in January or The course will take place in January.

Because Hungarian often expresses meanings like in, on, or at by adding a suffix to the noun instead of using a separate preposition.

Here:

• január = January
• januárban = in January

The ending -ban means in here.

So English uses two words, in January, but Hungarian uses one word: januárban.

-ban is a case ending that often means in or inside.

Examples:

• házban = in the house
• iskolában = in the school
• januárban = in January

With months, this ending is the normal way to say in a certain month.

So:

• januárban = in January
• februárban = in February
• márciusban = in March

This is because of vowel harmony, which is a very important feature of Hungarian.

Hungarian suffixes often come in two versions:

• -ban
• -ben

Words with mostly back vowels usually take -ban.
Words with mostly front vowels usually take -ben.

Január has back vowels, so it becomes januárban.

Compare:

• januárban = in January
• szeptemberben = in September

So the choice between -ban and -ben depends on the vowels in the word.

Lesz is the future form of van (to be).

So:

• van = is
• lesz = will be

Because the sentence refers to the future, Hungarian uses lesz:

• A képzés januárban lesz. = The training will be in January.

This is a very common way to talk about future events with to be.

Because in this sentence, the future is built into the verb lesz itself.

English uses:

• will be

Hungarian uses:

• lesz

So lesz already includes the idea of will be.

That means:

• A képzés januárban lesz literally matches something like The training in-January will-be

Hungarian word order is more flexible than English word order.

This sentence is perfectly natural:

• A képzés januárban lesz.

But you could also say:

• Januárban lesz a képzés.

Both mean roughly the same thing, but the focus/emphasis can shift.

For example:

• A képzés januárban lesz.
  This can sound like you are stating when the training will happen.

• Januárban lesz a képzés.
  This puts more attention on January.

Hungarian word order often depends on what is being emphasized, not only on grammar.

It is talking about when an event will take place.

That matters because Hungarian uses van/lesz in a lot of everyday sentences to say that something is happening somewhere or sometime.

Here, lesz does not mean that the training becomes January or equals January. It means the training will take place in January.

So a more natural English interpretation is:

• The training will be in January
• The training will take place in January

A helpful rough guide is:

képzés ≈ kayp-zhaysh

A few important points:

• é is a long vowel, roughly like ay in say
• zs is pronounced like the s in measure
• s by itself in Hungarian sounds like English sh, but there is no separate s here at the end; the spelling is zs

A more careful breakdown:

• kép = kayp
• zés = something like zhaysh

So together: képzés

A rough pronunciation guide is:

januárban ≈ yah-noo-aar-bon

A few tips:

• j in Hungarian sounds like English y
• á is a long a, somewhat like the vowel in father
• ban has a short a, also a back vowel sound

So it is not pronounced like English January. It is closer to:

• ya-nu-aar-ban

In normal usage, lesz clearly points to the future, so the best translation is will be.

However, in English, people often say The training is in January even when talking about the future. So depending on style, that English translation may also sound natural.

Still, the Hungarian sentence itself contains a future verb:

• lesz = will be

So if you are matching grammar closely, will be is the most accurate translation.