כל מה שאני צריכה עכשיו הוא יום שקט, ספר טוב וקפה חם.

Because the sentence is being said by a female speaker.

• אני צריך = I need, said by a male
• אני צריכה = I need, said by a female

So if a man were speaking, the sentence would start:

כל מה שאני צריך עכשיו...

כל מה is a very common Hebrew structure meaning all that, everything that, or the only thing(s) that depending on context.

Literally:

• כל = all
• מה = what

But together in a sentence like this, כל מה ש... means all that...

So:

כל מה שאני צריכה עכשיו
= all that I need now

שאני is made of:

• ש = that / which
• אני = I

So שאני literally means that I.

In this sentence:

כל מה שאני צריכה עכשיו
= all that I need now

This ש is extremely common in spoken and written Hebrew. It introduces a clause, similar to that in English.

Yes, הוא usually means he, but here it is not really being used with the meaning he.

In sentences like this, Hebrew often uses הוא as a kind of linking word between two parts of the sentence, similar to is in English.

So here:

כל מה שאני צריכה עכשיו הוא יום שקט...
means
All I need now is a quiet day...

This use of הוא is more formal or literary than everyday speech. It does not mean there is a male person involved.

Yes — and in everyday spoken Hebrew, that is often more natural.

A very common colloquial version is:

כל מה שאני צריכה עכשיו זה יום שקט, ספר טוב וקפה חם.

Both are correct, but:

• הוא sounds a bit more formal, polished, or written
• זה sounds more natural in conversation

Because צריך / צריכה can take a direct noun as its complement.

So you can say:

• אני צריכה קפה = I need coffee
• אני צריכה יום חופש = I need a day off

But if what follows is a verb, Hebrew usually uses ל + infinitive:

• אני צריכה לנוח = I need to rest
• אני צריכה לעבוד = I need to work

So in this sentence, since what follows is a list of nouns, no preposition is needed.

Because Hebrew normally has no indefinite article.

English has:

• a quiet day
• a good book
• a hot coffee

Hebrew just says:

• יום שקט
• ספר טוב
• קפה חם

If something is definite (the), Hebrew uses ה־:

• היום השקט = the quiet day
• הספר הטוב = the good book

But for a/an, Hebrew usually uses nothing.

Because in Hebrew, adjectives normally come after the noun they describe.

So:

• יום שקט = quiet day
• ספר טוב = good book
• קפה חם = hot coffee

This is the normal Hebrew word order:

noun + adjective

not

adjective + noun

Because each adjective must agree with the noun it describes in gender and number.

Here the nouns are all singular masculine:

• יום = masculine singular
• ספר = masculine singular
• קפה = masculine singular in standard Modern Hebrew

So the adjectives are also masculine singular:

• יום שקט
• ספר טוב
• קפה חם

If the nouns were feminine, the adjectives would change:

• אווירה שקטה
• מילה טובה
• שתייה חמה

Yes. In standard Modern Hebrew, קפה is treated as masculine, so:

• קפה חם = hot coffee

That is why the adjective is חם and not חמה.

עכשיו means now, and Hebrew allows some flexibility in where adverbs like this appear.

Here:

כל מה שאני צריכה עכשיו...
means
all that I need now...

This placement sounds natural and straightforward. You may also hear slightly different word orders in Hebrew, but this one is very standard.

Because Hebrew usually does not use the serial comma as regularly as English sometimes does.

So this is normal:

יום שקט, ספר טוב וקפה חם

rather than:

יום שקט, ספר טוב, וקפה חם

The version without the comma before ו is the most standard style.

Yes, but one word must change:

• female speaker: כל מה שאני צריכה עכשיו...
• male speaker: כל מה שאני צריך עכשיו...

Everything else can stay the same.

So a man would say:

כל מה שאני צריך עכשיו הוא יום שקט, ספר טוב וקפה חם.