Moje maminka chce připravit teplou večeři.

Moje means my.

In Czech, this kind of word changes form to match the noun it goes with. Here it goes with maminka (mother / mom), which is feminine singular and is the subject of the sentence, so moje is the correct form here.

So:

• moje maminka = my mom / my mother

Yes. Both moje maminka and má maminka are correct.

Very roughly:

• moje maminka = very common, natural
• má maminka = also correct, sometimes a bit shorter or more stylistic

As a learner, moje maminka is perfectly safe and very natural.

Maminka is a more affectionate, family-style word, like mom, mum, or sometimes mommy/mummy depending on context.

Compare:

• maminka = warm, personal, affectionate
• máma = common everyday mom
• matka = more formal, neutral, or sometimes cold/official-sounding mother

So moje maminka sounds more loving and natural in a family context than moje matka.

Because the subject is maminka, which is third person singular: she.

The verb is from chtít = to want.

Present tense:

• chci = I want
• chceš = you want
• chce = he/she/it wants

So:

• maminka chce = mom wants

In Czech, after a verb like chtít (to want), you normally use the infinitive directly:

• chce připravit = wants to prepare

The infinitive připravit already corresponds to English to prepare. Czech does not need a separate extra word here.

This is about aspect, which is very important in Czech.

• připravit = perfective, one completed action
• připravovat = imperfective, ongoing, repeated, or habitual action

In this sentence, the idea is that she wants to prepare a dinner as a completed result, so připravit is the natural choice.

Compare:

• chce připravit teplou večeři = she wants to prepare a warm dinner
• každý den připravuje teplou večeři = every day she prepares a warm dinner

Because teplou večeři is the direct object of the verb připravit, so it must be in the accusative case.

Dictionary forms are:

• teplá = warm
• večeře = dinner

But in the accusative singular:

• teplá → teplou
• večeře → večeři

So:

• teplá večeře = a warm dinner (subject form / nominative)
• připravit teplou večeři = to prepare a warm dinner (object form / accusative)

Because Czech adjectives must agree with the noun they describe in:

• gender
• number
• case

Here teplou describes večeři, so both have to match.

Since večeře is:

• feminine
• singular
• accusative

the adjective must also be:

• feminine
• singular
• accusative

That is why you get teplou večeři, not teplá večeře.

In practice, it can cover the idea of a warm/hot meal.

So teplou večeři usually suggests a dinner that is served warm, often a proper cooked meal rather than something cold like bread or a sandwich.

The exact English choice depends on context:

• warm dinner
• hot dinner
• a hot meal for dinner

All can work depending on how natural you want the English to sound.

It mainly means prepare dinner, but in many contexts that naturally includes cook dinner.

So it is a bit broader than just cook. It could mean:

• cooking it
• getting it ready
• arranging the meal

If you translate it as cook dinner, that may be fine in many situations, but the Czech verb itself is not limited only to cooking.

Czech has no articles.

So Czech does not have separate words corresponding directly to English a/an and the.

That means:

• teplou večeři can mean a warm dinner
• and in another context it could also mean the warm dinner

Context tells you which meaning is intended. In this sentence, English will usually use a warm dinner.

Yes. Czech word order is more flexible than English because the case endings show what each word is doing.

This sentence has a neutral, natural order:

• Moje maminka chce připravit teplou večeři.

But other orders are possible for emphasis, for example:

• Teplou večeři chce připravit moje maminka.

That might emphasize the warm dinner or contrast my mom with someone else.

As a learner, the original order is the best one to use first.