נפתחה גם הרשמה לסדנה קצרה בכתיבה, והמנחה שלה נשמעת מצוינת.

נפתחה is the past tense, feminine singular form of the verb נפתח, from the root פ־ת־ח (to open).

Here it means something like:

• opened
• was opened
• has opened

In this kind of announcement, Hebrew often uses נפתח / נפתחה for things like registration, applications, enrollment, ticket sales, and so on.

So נפתחה הרשמה is a very common way to say registration has opened.

Because הרשמה is a feminine singular noun, and the verb agrees with it.

So:

• הרשמה = feminine singular
• therefore נפתחה = feminine singular

If the subject were masculine singular, you would expect a masculine form instead.

This is very common in Hebrew announcements.

Literally, נפתחה הרשמה is past: registration opened. But in natural English, the best translation is often:

• registration has opened
• registration is now open

Hebrew uses the past here to announce a new state or event that has just happened. English often prefers present perfect or a present-style phrasing.

So the Hebrew tense is past, but the real-world meaning is often it is now open.

Hebrew often allows, and frequently prefers, verb-first word order, especially in formal or informational sentences.

So:

• נפתחה גם הרשמה...
  literally: opened also registration...

This is completely natural Hebrew.

If you put the subject first, גם הרשמה נפתחה..., that is also possible, but it gives a slightly different emphasis. The version in your sentence sounds very natural for an announcement.

גם means also / too.

In נפתחה גם הרשמה, it means that registration has also opened, probably in addition to something else mentioned earlier.

Hebrew is fairly flexible about where גם appears, but here it attaches naturally to the whole idea that registration, too, is now open.

Yes. הרשמה commonly goes with ל־ when talking about registering for something.

So:

• הרשמה לסדנה = registration for a workshop
• להירשם לסדנה = to register for a workshop

That preposition is just the normal Hebrew pattern.

Also, in unpointed Hebrew, לסדנה can sometimes look ambiguous, but here the phrase is clearly indefinite because of the full noun phrase סדנה קצרה = a short workshop, not the short workshop.

Because in Hebrew, adjectives usually come after the noun.

So:

• סדנה קצרה = a short workshop
• literally: workshop short

Also, the adjective must agree with the noun in:

• gender
• number
• definiteness

Since סדנה is feminine singular, the adjective is קצרה, also feminine singular.

בכתיבה literally means in writing.

In this sentence, it describes the type of workshop:

• סדנה קצרה בכתיבה = a short workshop in writing
• more natural English: a short writing workshop

So ב־ here is functioning like in / on, as it often does when talking about a subject area.

שלה means hers or its, depending on what it refers to.

Here it refers back to הסדנה / סדנה, which is a feminine singular noun. So:

• המנחה שלה = its instructor
• literally: the instructor of it/her

This is important for English speakers: Hebrew does not distinguish her and its the way English does. The form שלה is used for a feminine singular possessor, whether that possessor is a person or a thing.

In this sentence, המנחה is understood as feminine, and we know that from the words that follow it:

• נשמעת = feminine singular
• מצוינת = feminine singular

So the instructor is being described as female.

A useful detail: מנחה can refer to a male or female instructor/host/facilitator, and the surrounding grammar shows which one is meant.

For example:

• female: המנחה נשמעת מצוינת
• male: המנחה נשמע מצוין

נשמעת comes from the root ש־מ־ע (to hear), and in this pattern it means sounds.

So:

• היא נשמעת מצוינת = she sounds excellent
• literally: she is heard excellent, but that is not how you would translate it naturally

This is the normal Hebrew way to say that someone or something sounds good, interesting, convincing, excellent, and so on.

Both words agree with המנחה.

• נשמעת = feminine singular sounds
• מצוינת = feminine singular excellent

So Hebrew is showing agreement twice:

1. the verb-like form נשמעת
2. the adjective מצוינת

If the instructor were male, the sentence would change to:

• והמנחה שלה נשמע מצוין

Notice something subtle there: שלה would stay the same if it still referred to the workshop, because שלה agrees with the owner (the workshop, feminine), not with the instructor.