הסיום של הפרק הזה היה מעניין כל כך, שמיד התחלתי את הפרק הבא.

Both words relate to end, but they are not always used in exactly the same way.

• סוף = end in a broad, general sense
• סיום = ending, conclusion, or finish

In a sentence about a chapter, movie, book, or episode, הסיום often sounds more natural if you mean the ending part. So הסיום של הפרק הזה is like saying the ending of this chapter.

Yes. של is the common Hebrew way to say of or show possession.

So:

• הסיום של הפרק הזה = the ending of this chapter

Hebrew can also use a construct form without של, for example:

• סיום הפרק הזה

That is also correct. The של structure is often clearer and very common in everyday Hebrew.

In Hebrew, demonstratives like this and that usually come after the noun.

So:

• הפרק הזה = this chapter
• literally: the chapter this

This is normal Hebrew word order. English says this chapter, but Hebrew says the chapter this.

They match the subject הסיום, which is masculine singular.

• הסיום = masculine singular
• היה = was for masculine singular
• מעניין = interesting in masculine singular

If the subject were feminine, the forms would change. For example:

• הסצנה הייתה מעניינת = the scene was interesting

So the grammar is agreeing with הסיום.

כל כך means so, so much, or so very depending on context.

In this sentence:

• מעניין כל כך = so interesting

This creates the pattern:

• so ... that ...

So the sentence means that the ending was so interesting that the speaker immediately started the next chapter.

Here ש means that and introduces the result clause.

The pattern is:

• כל כך ..., ש... = so ..., that...

So:

• מעניין כל כך, שמיד התחלתי...
• so interesting that I immediately started...

The ש connects the first idea with the consequence.

Yes. You may see both:

• שמיד
• שמיד
• and also שמיד written in more connected style in modern text

More carefully put, the important point is that ש attaches to the following word in Hebrew spelling, so שמיד means that immediately or more naturally that I immediately...

This is very common with ש:

• שאני = that I
• שזה = that this/that it is
• שמיד = that immediately

Because Hebrew often leaves out subject pronouns when the verb already makes the subject clear.

• התחלתי = I started

The ending -תי tells you it is I in the past tense. So אני is unnecessary unless the speaker wants extra emphasis.

Compare:

• התחלתי את הפרק הבא = I started the next chapter
• אני התחלתי את הפרק הבא = I started the next chapter with extra emphasis on I

את marks a definite direct object.

Here, הפרק הבא is a specific, definite thing: the next chapter. So Hebrew uses את before it.

• התחלתי את הפרק הבא = I started the next chapter

If the object were indefinite, there would usually be no את:

• התחלתי פרק חדש = I started a new chapter

So את does not mean anything by itself in English; it is a grammar marker.

Because in Hebrew, if the noun is definite, the adjective must also be definite.

• הפרק = the chapter
• הבא = the next

Together:

• הפרק הבא = the next chapter

Hebrew adjectives usually come after the noun, and they match it in definiteness, gender, and number.

Compare:

• פרק הבא = not correct in standard Hebrew
• הפרק הבא = correct
• פרק חדש = a new chapter
• הפרק החדש = the new chapter

Yes. Hebrew word order is fairly flexible, especially with adverbs.

In this sentence:

• שמיד התחלתי את הפרק הבא = that I immediately started the next chapter

You could also hear:

• שהתחלתי מיד את הפרק הבא
• שהתחלתי את הפרק הבא מיד

These can all work, although the original sounds very natural. Putting מיד early often emphasizes the immediacy of the action.

It is common and helpful, because the sentence has a so ... that ... structure.

• היה מעניין כל כך, שמיד התחלתי...

The comma marks the break between the main statement and the result clause. In informal writing, punctuation in Hebrew can vary, but this comma is perfectly natural and makes the sentence easier to read.