i aep sayongbeobeul ilggo naseo sseo bwayo.

A natural breakdown is:

• 이 = this
• 앱 = app
• 사용법 = way of using / instructions / how to use
• 을 = object marker
• 읽고 나서 = after reading
• 써 봐요 = try using it

So the sentence structure is basically:

[this app’s instructions] + [after reading] + [try using it]

A very natural English translation would be:

• After reading how to use this app, try using it.

을/를 marks the direct object of a verb.

Here, the verb is 읽다 (to read), and the thing being read is 이 앱 사용법 (the instructions for this app).

So:

• 이 앱 사용법을 읽다 = to read the instructions for this app

Since 사용법 ends in a consonant, it takes 을 rather than 를.

• consonant ending → 을
• vowel ending → 를

사용법 is a very common noun meaning:

• how to use something
• instructions for use
• usage method

It is made from:

• 사용 = use
• 법 = method / way

So 앱 사용법 literally means:

• app usage method
• more naturally, how to use the app or the app’s instructions

In English, we would usually not translate it word-for-word.

Korean often leaves out 의 when one noun modifies another.

So both of these can work:

• 앱 사용법
• 앱의 사용법

But 앱 사용법 is more natural and common in everyday Korean, especially in short practical phrases like instructions, menus, labels, or guides.

It functions like a noun-noun compound:

• 앱 사용법 = app instructions / how to use the app

읽고 나서 means after reading.

It emphasizes that one action happens first, and then the next action happens afterward.

• 읽고 나서 써 봐요 = Read it first, and then try using it

By contrast, 읽고 by itself can simply connect two actions:

• 읽고 써 봐요

This can also mean something like read it and try using it, but 읽고 나서 more clearly stresses the sequence:

1. read first
2. then try using it

So -고 나서 is very common when you want to say after doing X, do Y.

In this sentence, 보다 is not the main verb to see. It is the auxiliary grammar pattern -아/어 보다, which means:

• to try doing something

So:

• 쓰다 = to use / to write
• 써 보다 = to try using / to try writing

Here, because the context is 앱 사용법 (instructions for using the app), 써 보다 means:

• try using it

This pattern is extremely common:

• 먹어 봐요 = try eating it
• 가 봐요 = try going
• 읽어 봐요 = try reading it
• 써 봐요 = try using it

The base verb is 쓰다.

When you attach -어 보다, it becomes:

• 쓰다 → stem 쓰-
• 쓰 + 어 보다
• 써 보다

So 쓰어 보다 contracts to 써 보다.

That is why you get:

• 써 봐요

not

• 쓰 봐요

This is just a normal conjugation pattern.

Also, standard spacing is:

• 써 봐요

because 보다 here is an auxiliary verb.

Yes—쓰다 has multiple meanings, and two very common ones are:

• to write
• to use

So context matters.

Examples:

• 편지를 쓰다 = to write a letter
• 이 앱을 쓰다 = to use this app
• 안경을 쓰다 = to wear glasses

In this sentence, because we are talking about 사용법 (instructions for use), the meaning is clearly to use, not to write.

So 써 봐요 here means:

• try using it

not

• try writing

-아요/어요 is the standard polite style.

So 써 봐요 is polite and conversational. It sounds like:

• Please try using it
• Try using it
• You should try using it

Depending on tone and context, it can sound like:

• a gentle suggestion
• friendly instructions
• a polite recommendation

It is less formal than 써 보세요, but still polite.

Compare:

• 써 봐 = casual
• 써 봐요 = polite conversational
• 써 보세요 = more politely instructive / more formal

Korean often omits objects when they are obvious from context.

Here, the earlier part already mentions:

• 이 앱 사용법 = how to use this app

So when the sentence says 써 봐요, the listener naturally understands:

• try using the app

Korean does this very often. Once the topic or object is clear, it can be left out.

A fuller version could be something like:

• 이 앱 사용법을 읽고 나서 이 앱을 써 봐요.

But that sounds repetitive, so the shorter original sentence is more natural.

It can feel like any of these depending on context, but most naturally it sounds like:

• a polite instruction
• a suggestion
• a piece of advice

For example, in an app guide or tutorial, it may feel close to:

• Read the instructions first, then try using it.

In conversation, it may feel more like:

• Why don’t you read the instructions first and then try it?

So the grammar itself is polite, but not harsh or strongly commanding.

Yes. A few alternatives are possible:

• 읽고 나서 = after reading
• 읽은 후에 = after reading
• 읽은 다음에 = after reading / after that

Examples:

• 이 앱 사용법을 읽고 나서 써 봐요.
• 이 앱 사용법을 읽은 후에 써 봐요.
• 이 앱 사용법을 읽은 다음에 써 봐요.

All are grammatical.

The original 읽고 나서 feels very natural and common in everyday spoken Korean.

• -고 나서 often feels conversational
• -은 후에 can sound a bit more formal or written
• -은 다음에 is also common and natural

The standard spacing is:

• 써 봐요

because 보다 in -아/어 보다 is treated as a separate auxiliary verb.

So standard written Korean usually separates it:

• 먹어 봐요
• 읽어 봐요
• 써 봐요

That said, in informal writing, many people write it 붙여서 (without a space):

• 써봐요

But if you are learning standard Korean, it is best to write:

• 써 봐요