כל משתמש צריך לבחור סיסמה טובה ולעדכן אותה לפעמים.

Because כל + singular noun usually means every or each in Hebrew.

So:

• כל משתמש = every user
• כל המשתמשים = all the users

This is a very common pattern. Even though English often thinks of a group, Hebrew uses the singular noun after כל when the meaning is every.

It matches משתמש, which is singular masculine.

In this sentence:

• משתמש = singular masculine
• צריך = singular masculine

So the agreement is normal.

If the subject were feminine singular, it would be:

• כל משתמשת צריכה...

If it were masculine plural:

• כל המשתמשים צריכים...

Hebrew usually marks gender and number much more clearly than English does.

It can cover a range like needs to, has to, or sometimes should, depending on context.

In this sentence, צריך לבחור סיסמה טובה most naturally means something like:

• needs to choose a good password
• should choose a good password

So it expresses necessity or recommendation. In everyday Hebrew, צריך + infinitive is very common for this idea.

Because after צריך, Hebrew normally uses an infinitive.

So the pattern is:

• צריך לבחור = needs to choose
• צריך לעדכן = needs to update

This is similar to English needs to choose, where choose is not fully conjugated for person. In Hebrew, the infinitive usually begins with ל.

ו means and, and ל is part of the infinitive form.

So:

• לעדכן = to update
• ולעדכן = and to update

Hebrew keeps the infinitive marker ל even after ו. So the structure is:

• צריך לבחור... ולעדכן...
• needs to choose... and to update...

English often omits the second to, but Hebrew normally keeps it.

Because one צריך can govern both infinitives.

So:

• צריך לבחור סיסמה טובה ולעדכן אותה לפעמים

means:

• needs to choose a good password and update it sometimes

Hebrew does not need to repeat צריך if the same subject and same modal idea continue.

Because סיסמה is a feminine noun, and adjectives must agree with the noun in gender and number.

So:

• סיסמה = feminine singular
• טובה = feminine singular adjective

Compare:

• ספר טוב = a good book
• סיסמה טובה = a good password

This kind of adjective agreement is one of the biggest differences from English.

אותה means it here, referring back to סיסמה.

Since סיסמה is feminine singular, the pronoun must also be feminine singular:

• סיסמה → אותה

So:

• לעדכן אותה = to update it

Even though English uses it for objects regardless of gender, Hebrew chooses the pronoun according to the grammatical gender of the noun.

Because אותה is already the direct-object pronoun form.

Compare:

• לעדכן את הסיסמה = to update the password
• לעדכן אותה = to update it

You do not say את אותה here. The word אותה already does the job of a marked direct object pronoun.

Here it functions as a noun meaning user.

Historically, משתמש is the masculine singular present/participle form of the verb להשתמש = to use. But in modern Hebrew, this form is also commonly used as a noun:

• משתמש = user
• משתמשת = female user
• משתמשים = users

So in this sentence, it is best understood simply as the noun user.

לפעמים means sometimes or from time to time.

Here it comes at the end:

• ולעדכן אותה לפעמים = and update it sometimes

That is a very natural position, but Hebrew adverbs like this can sometimes move depending on emphasis. Still, the end position is simple and common.

A natural pronunciation is:

kol mishtamesh tsarikh livkhor sisma tova ule'adken ota lif'amim

A few helpful notes:

• כל = kol
• משתמש = mishtamesh
• צריך = tsarikh
• לבחור = livkhor
• סיסמה = sisma
• טובה = tova
• ולעדכן = ule'adken
• אותה = ota
• לפעמים = lif'amim

Exact pronunciation can vary a little by speaker, but this is a good standard guide.

Grammatically, it is in the masculine singular, but Hebrew often uses the masculine singular as a generic form.

So כל משתמש צריך... can mean every user should..., not only male users.

If someone wanted to make both genders explicit, they might write something more inclusive, such as:

• כל משתמש או משתמשת צריכים/צריכות...

But in ordinary Hebrew, the masculine singular is very often used generically in instructions and general statements.