التسجيل في الدورة يبدأ اليوم.

التسجيل is a verbal noun (called a maṣdar in Arabic). It comes from the verb سجّل (to register / to record), but here it functions as a noun, not as a finite verb.

So in this sentence, التسجيل means something like:

• registration
• enrollment
• the act/process of registering

That is why the sentence is built around a noun phrase rather than starting with a verb.

The prefix الـ is the Arabic definite article, meaning the.

So:

• تسجيل = registration / registering
• التسجيل = the registration / registration (in a more definite, known sense)

In announcements like this, Arabic often uses the definite form where English might still say just registration without stressing the. So التسجيل في الدورة naturally means registration for/in the course.

Literally, في الدورة means in the course:

• في = in
• الدورة = the course

In this sentence, it is attached to التسجيل, so the whole phrase means registration in the course or more naturally in English, registration for the course.

Arabic often uses في where English might prefer for, depending on the expression.

Both can be possible in Arabic depending on style and nuance, but التسجيل في الدورة is a very common expression.

• في الدورة suggests enrollment in the course
• للدورة can suggest registration for the course

In practice, both may appear in real Arabic, but التسجيل في الدورة sounds very natural and standard.

Not always. دورة has several related meanings depending on context, such as:

• course (especially a training course)
• session
• cycle
• round

In this sentence, because it is about registration, الدورة clearly means course, especially a class or training program.

The verb يبدأ agrees with the main subject, which is التسجيل.

The head of the subject phrase is التسجيل, and that noun is:

• singular
• masculine

So the verb is also singular masculine:

• يبدأ = it begins / begins

Even though في الدورة follows it, that part is just a prepositional phrase and does not control agreement.

The subject is the whole phrase:

التسجيل في الدورة

More specifically:

• the core noun is التسجيل
• في الدورة describes which registration we are talking about

So the sentence is essentially:

• [Registration in the course] begins today

It begins with a noun phrase, so it is usually analyzed as a nominal sentence:

• التسجيل في الدورة = the topic / subject
• يبدأ اليوم = the predicate, which happens to contain a verb

So it is a nominal sentence whose predicate is a verbal phrase.

Yes. That would also be correct.

Compare:

• التسجيل في الدورة يبدأ اليوم
  Focuses first on registration in the course
• يبدأ التسجيل في الدورة اليوم
  Starts more directly with the action begins

Both are natural. Arabic allows more flexibility in word order than English.

Arabic often does not use a present-tense verb meaning is/am/are the way English does.

However, in this sentence, there is already a real verb: يبدأ (begins). So no separate word for is is needed.

Arabic would only need an explicit verb like كان when talking about past or certain other structures.

اليوم means today, and here it functions as an adverb of time.

So:

• يبدأ اليوم = begins today

Even though اليوم literally contains الـ, it is simply the normal word for today in this expression.

It is pronounced roughly yabda'u in full formal pronunciation.

A few helpful notes:

• يـ = ya-
• بد = bd
• أ is a hamza, a glottal stop
• the final vowel is often not pronounced in pause, so in normal reading you may hear something like yabda'

So in careful MSA:

• يبدأ اليوم ≈ yabda'u al-yawma

In normal pause:

• يبدأ اليوم ≈ yabda' al-yawm

In Arabic, the present tense can often express a near future or a scheduled future, especially when the context makes the time clear.

So:

• يبدأ اليوم literally = begins today
• natural English meaning = starts today

This is very similar to English expressions like:

• The course starts today
• Registration opens today

So the present tense here is completely natural.

Yes. تسجيل can have different meanings depending on context, including:

• registration / enrollment
• recording
• documentation

Here, because of في الدورة (in the course), the meaning is clearly registration/enrollment, not recording.

Context is what tells you which meaning is intended.