Mióta minden nap gyakorlok, jó a kompozíció.

Here mióta means since or ever since. It introduces a time clause:

Mióta minden nap gyakorlok = Since I practice every day / Ever since I started practicing every day

In questions, mióta can also mean since when? or for how long?, but here it is not a question word.

Also, in this sentence it is mainly temporal, not causal. It points to a period starting in the past and continuing up to now.

Yes. Amióta is also very common in this meaning, and many learners meet it often in sentences like this.

So these are both possible:

• Mióta minden nap gyakorlok, jó a kompozíció.
• Amióta minden nap gyakorlok, jó a kompozíció.

In practice, amióta may sound a little more explicitly like a conjunction introducing a subordinate clause, while mióta is also used as a question word. But both are acceptable here.

Because Hungarian often uses the present tense for an action or habit that started in the past and still continues now.

So:

Mióta minden nap gyakorlok
literally: Since I practice every day

But in natural English, this may correspond to:

• Ever since I’ve been practicing every day
• Since I started practicing every day
• Since I practice every day

English often prefers a present perfect or present perfect progressive here, but Hungarian commonly just uses the present.

Gyakorlok is the 1st person singular present tense form of gyakorol = to practice.

So:

• gyakorolok / gyakorlok = I practice

The ending shows the subject, so the verb itself already tells you that the subject is I.

Because Hungarian has two main verb conjugation patterns: indefinite and definite.

Here, no definite direct object is stated, so Hungarian uses the indefinite form:

• gyakorlok = I practice

If there were a specific object, you would often use the definite form:

• A darabot gyakorlom. = I am practicing the piece.
• A zongorát gyakorlom. = I am practicing the piano (depending on meaning/context)

So gyakorlok is the correct choice when the sentence simply says I practice without naming a specific object.

Because Hungarian usually does not need a subject pronoun when the verb ending already shows the person.

Here, -ok tells you it is I:

• gyakorlok = I practice

You could add én, but then it would sound emphatic or contrastive:

• Én gyakorlok minden nap. = I practice every day / I’m the one who practices every day

Without emphasis, leaving out én is normal.

Because minden nap is the normal way to say every day in this sentence.

• minden = every
• nap = day

So literally: every day

Hungarian also has mindennap, but learners should be careful because the one-word and two-word forms are not always used in exactly the same way. In a simple time expression like this, minden nap is the safest and most straightforward choice.

Because the sentence begins with a subordinate clause, and Hungarian normally separates clauses with a comma.

Structure:

• Mióta minden nap gyakorlok, = subordinate clause
• jó a kompozíció. = main clause

So the comma is standard punctuation here.

In Hungarian, the verb van = is is usually omitted in the 3rd person singular present tense when the predicate is a noun or adjective.

So Hungarian says:

• A kompozíció jó.
• Jó a kompozíció.

not:

• A kompozíció van jó. ✗

This is a very common Hungarian pattern.

But van does appear in other situations, for example:

• past tense: jó volt = was good
• future: jó lesz = will be good
• existence/location: Itt van. = It is here.

Both are possible, but they are not felt exactly the same.

• Jó a kompozíció.
  This is a very natural way to say the composition is good, with the quality good presented prominently.

• A kompozíció jó.
  This is also correct, but it sounds more like as for the composition, it is good, or it may feel a bit more topic-based or contrastive depending on context.

Hungarian word order is strongly connected to information structure and emphasis, not just grammar. So changing the order can slightly change what feels more prominent.

Because a is the definite article, meaning the.

So:

• a kompozíció = the composition

Hungarian often uses the definite article with nouns that are understood as specific from the context. If the speaker and listener know which composition is being discussed, the article is natural.

So jó a kompozíció is literally the composition is good. Depending on the wider context, English might translate this more loosely, but grammatically the article is completely normal in Hungarian.