U rokovnik stavljam podsjetnik za svaki sastanak.

Because Croatian distinguishes between:

• movement into somewhere → u + accusative
• location inside somewhere → u + locative

Here, stavljam means I put / I place, so there is a sense of movement into the planner:

• u rokovnik = into the planner

If you were describing where something already is, you would use the locative:

• Podsjetnik je u rokovniku. = The reminder is in the planner.

So:

• stavljam u rokovnik = I am putting into the planner
• je u rokovniku = it is in the planner

Rokovnik is a masculine inanimate noun, and in the singular its accusative form is often the same as the nominative form.

So:

• nominative: rokovnik
• accusative: rokovnik

That is why you do not see a visible ending change here, even though the case has changed.

Rokovnik usually means a planner, datebook, agenda, or appointment book.

It is not just any notebook. It usually suggests something used to organize dates, meetings, tasks, or appointments.

Depending on context, English translations might be:

• planner
• diary
• appointment book
• agenda book

Stavljam is the 1st person singular present tense of the imperfective verb stavljati / stavljam.

It means:

• I put
• I am putting
• I place
• sometimes I write down / enter, depending on context

In Croatian, the present tense can cover both simple present and present continuous meanings that English separates.

So stavljam could mean:

• I put a reminder...
• I’m putting a reminder...
• I enter a reminder...

depending on the situation.

Croatian often uses staviti / stavljati very broadly, including situations where English might say:

• put
• place
• add
• enter
• write down

In this sentence, stavljam podsjetnik u rokovnik means something like:

• I put a reminder in my planner
• I enter a reminder in my planner
• I write a reminder in my planner

So it is natural Croatian, even if English might prefer a different verb.

Podsjetnik is the direct object of stavljam, so it is in the accusative case.

However, just like rokovnik, it is a masculine inanimate singular noun, so the accusative looks the same as the nominative:

• nominative: podsjetnik
• accusative: podsjetnik

That is why the form does not visibly change.

Podsjetnik means reminder.

It can refer to:

• a written reminder
• a note to remind yourself of something
• a reminder entry in a planner or calendar
• sometimes even a prompt or cue

In this sentence, it most naturally means a reminder note or planner entry.

Za here means for, and svaki sastanak means every meeting.

The phrase means:

• for every meeting
• for each meeting

After za, Croatian usually uses the accusative case.

So:

• za
  • accusative
• svaki sastanak = accusative singular masculine inanimate

Again, because sastanak is masculine inanimate, its accusative singular looks the same as the nominative:

• nominative: sastanak
• accusative: sastanak

They are related, but they are used differently:

• svaki = each / every
  • singular noun
• svi = all
  • plural noun or everyone

Examples:

• svaki sastanak = every meeting / each meeting
• svi sastanci = all meetings

So in your sentence:

• za svaki sastanak = for every meeting

not

• za svi sastanci ✘

Yes. Croatian word order is more flexible than English because cases show grammatical roles.

The original sentence:

• U rokovnik stavljam podsjetnik za svaki sastanak.

is perfectly natural.

Other possible orders include:

• Stavljam podsjetnik u rokovnik za svaki sastanak.
• Podsjetnik za svaki sastanak stavljam u rokovnik.

These versions may shift emphasis slightly:

• U rokovnik... emphasizes where you put it
• Podsjetnik... emphasizes what you put
• Za svaki sastanak... would emphasize frequency/distribution

So word order can change, but not completely freely; it affects style and focus.

Grammatically, it is into the planner, because u + accusative expresses direction or movement.

In English, though, we often translate it more naturally as:

• in the planner

So:

• literal grammar sense: into the planner
• natural English translation: in the planner

That difference is very common when translating Croatian prepositions.

Croatian often leaves out possessives like my, your, his, etc. when the meaning is clear from context.

So:

• U rokovnik stavljam... can naturally mean I put ... in my planner

even though my is not stated.

If you want to make it explicit, you could say:

• U svoj rokovnik stavljam podsjetnik za svaki sastanak. = I put a reminder in my own planner for every meeting.

But in many everyday situations, that would sound unnecessary.

Yes, that is the most natural interpretation.

It suggests:

• for each meeting, I put a reminder in my planner
• in other words, one reminder for every meeting

So the sentence conveys a repeated or regular habit.

It can be either, depending on context.

Because stavljam is present tense, it can mean:

• a habit: I put a reminder in my planner for every meeting
• an action happening now: I’m putting a reminder in my planner for every meeting

Without extra context, many learners would understand it as a habitual action, because of za svaki sastanak.

Yes, but the meaning changes slightly.

• u rokovnik = in a planner / agenda book
• u kalendar = in a calendar

Both are possible, but they suggest different things:

• rokovnik feels like a personal organizer or datebook
• kalendar focuses more directly on a calendar system

So if you mean a planner or agenda, rokovnik is a good choice.