nimotu no tuisekibangou wo sumaho ni hozonsite okeba, ima doko ni aru ka sugu wakarimasu.

This is a noun phrase made with の:

• 荷物 = package / baggage
• 追跡番号 = tracking number

So 荷物の追跡番号 means the package’s tracking number or the tracking number for the package.

Here, の connects two nouns, and the first noun describes the second one. A very common pattern is:

• A の B = B of A / B for A / A’s B

So this is not a full clause; it is just one chunk: package + tracking number.

を marks the direct object of the verb.

In this sentence, the main action in the first part is 保存しておけば (if you save it / if you keep it saved), and the thing being saved is 荷物の追跡番号.

So:

• 荷物の追跡番号を保存する = to save the package’s tracking number

A good way to spot を is to ask: What are you saving?
Answer: the tracking number.

In スマホに保存しておけば, に marks the place where something is saved.

So:

• スマホに保存する = save it on/in your smartphone

This is similar to how に often marks a destination or target location. With digital storage, Japanese often uses に for the device, app, folder, etc. where something is put.

Examples:

• スマホに入れる = put it on your phone
• パソコンに保存する = save it on your computer
• メモ帳に書く = write it in a memo pad

This is built from:

• 保存する = to save
• 〜ておく = do something in advance / do something and leave it that way
• 〜ば = if

So:

• 保存しておく = save it in advance / keep it saved
• 保存しておけば = if you save it in advance / if you’ve got it saved

The nuance is important: it is not just save in a neutral sense. It suggests doing it beforehand because it will be useful later.

So the sentence implies something like:
If you save the tracking number on your phone ahead of time, ...

Both can mean if you save it, but 保存しておけば has an added sense of preparation or doing it for later convenience.

• 保存すれば = if you save it
• 保存しておけば = if you save it beforehand / if you keep it saved for later

〜ておく often gives that feeling of:

• doing something in advance
• doing something just in case
• leaving something in a useful state

In this sentence, that nuance fits very naturally, because saving the tracking number now helps you check the package later.

どこにあるか is an embedded question. It means where it is.

Breakdown:

• どこ = where
• にある = is located at
• か = turns the question into a clause

So:

• どこにあるか = where it is / where it’s located

This is different from a direct question.

Direct question:

• どこにありますか。 = Where is it?

Embedded question inside a larger sentence:

• どこにあるか分かります。 = You can tell / know where it is.

In English, this is similar to:

• direct question: Where is it?
• embedded question: I know where it is.

Japanese uses か to mark that embedded question.

Because the thing being talked about is a package, and packages are inanimate objects.

Japanese generally uses:

• ある for things
• いる for people and animals

So:

• 荷物がある = the package is there
• 人がいる = a person is there

In 今どこにあるか, the hidden subject is basically the package or it, so ある is the correct verb.

Yes, 今 literally means now, but in this sentence it is closer to currently / at the moment.

So 今どこにあるか means:

• where it is now
• where it currently is

With package tracking, 今 emphasizes the package’s current location/status, not just its location in general.

That is very normal Japanese word order.

Japanese often puts a whole clause before the main verb. Here, どこにあるか is the thing that is understood/known.

So the structure is roughly:

• 今どこにあるか = where it is now
• すぐ分かります = you can tell right away / you’ll know quickly

Put together:

• 今どこにあるかすぐ分かります = you can quickly find out where it is now

In English, we often say:

• You can quickly see where it is now.

In Japanese, the content that is known comes before 分かる.

分かる often gets translated as understand, but in many cases it is better translated as:

• know
• find out
• see
• tell

Here, すぐ分かります does not mean deep intellectual understanding. It means something more like:

• you can quickly see
• you’ll know right away
• you can immediately find out

That is why context matters with 分かる. In this sentence, it is about easily checking the package’s current location.

The subject is not stated, which is very common in Japanese.

From context, it is understood as something like:

• you
• one
• the person using the tracking number

So すぐ分かります here means something like:

• you can tell right away
• you’ll know immediately

Japanese often leaves out subjects when they are obvious from context. A natural English translation usually has to add one, but the Japanese sentence itself does not need it.

分かります is the polite form of 分かる.

So the sentence is written in polite style:

• 保存しておけば ... 分かります

This is very common in instructions, customer service language, websites, and everyday polite speech.

A casual version might look like:

• 荷物の追跡番号をスマホに保存しておけば、今どこにあるかすぐ分かる。

Same basic meaning, just less polite.

Yes. スマホ is just a casual, very common shortening of スマートフォン.

You could replace it with things like:

• スマートフォンに = on your smartphone
• 携帯に = on your cellphone/phone
• パソコンに = on your computer
• メモ帳アプリに = in a notes app

The grammar stays the same:

• 〜に保存しておけば

So the sentence pattern is flexible; only the storage location changes.