मेरे भाई के लिए हिंदी पढ़ना आसान नहीं है, लेकिन मेरे लिए यह मुश्किल भी नहीं है।

Because के लिए is a postposition, and nouns/adjectives before a postposition usually go into the oblique form.

• Direct: मेरा भाई = my brother
• Before a postposition: मेरे भाई के लिए = for my brother

Here, मेरा changes to मेरे because it agrees with भाई in the oblique form.

के लिए means for.

So:

• मेरे भाई के लिए = for my brother
• मेरे लिए = for me

In this sentence, it shows whose point of view the statement is about:

• for my brother, reading Hindi is not easy
• but for me, it is not difficult either

पढ़ना is the infinitive form of the verb पढ़ना, meaning to read or to study.

In Hindi, an infinitive can act like a noun, similar to English reading or studying.

So:

• हिंदी पढ़ना = reading/studying Hindi

In this sentence, हिंदी पढ़ना is the whole activity being talked about.

It can mean either, depending on context.

In everyday Hindi, पढ़ना is often used for:

• reading
• studying
• sometimes learning a subject

So हिंदी पढ़ना can naturally mean:

• to read Hindi
• to study Hindi

In a sentence like this, many learners would understand it as studying/learning Hindi, because talking about something being easy or difficult often refers to learning it.

Because the subject here is the activity हिंदी पढ़ना, which is treated as a singular idea.

So:

• हिंदी पढ़ना आसान नहीं है
• यह मुश्किल भी नहीं है

Even though the idea may feel broad in English, Hindi treats पढ़ना here as one singular action, so है is correct.

लेकिन means but.

It connects the two contrasting ideas:

• For my brother, reading Hindi is not easy
• but for me, it is not difficult either

It marks a contrast between the brother's experience and the speaker's experience.

यह means this or it here, and it refers back to the activity already mentioned: हिंदी पढ़ना.

So यह मुश्किल भी नहीं है means:

• it is not difficult either

Hindi often uses यह to refer back to a previously mentioned idea. In this sentence, it avoids repeating हिंदी पढ़ना.

Here भी means also / too / either, depending on the sentence.

With the negative नहीं, it gives the sense of not ... either.

So:

• मुश्किल नहीं है = is not difficult
• मुश्किल भी नहीं है = is not difficult either

This matches the contrast created by लेकिन.

Yes, that is possible in conversation if the meaning is clear from context.

• लेकिन मेरे लिए यह मुश्किल भी नहीं है
• लेकिन मेरे लिए मुश्किल भी नहीं है

Both can work.

Including यह makes the sentence a little clearer and slightly more complete, because it explicitly refers back to हिंदी पढ़ना.

Yes, they are near-opposites:

• आसान = easy
• मुश्किल = difficult

But this pairing is very natural.

The first clause says:

• It is not easy for my brother

The second says:

• But for me, it is not difficult either

This does not mean exactly the same thing as it is easy for me. It is a bit softer and more nuanced. It suggests:

• it may not be especially easy,
• but it is definitely not hard for me.

So the speaker is expressing a mild contrast, not a dramatic one.

Because मेरे लिए is the natural way to express for me in judgments like easy, hard, useful, possible, and so on.

So Hindi commonly says:

• मेरे लिए यह आसान है = This is easy for me
• मेरे लिए यह मुश्किल है = This is difficult for me

Using मुझे would usually require a different structure, such as:

• मुझे हिंदी पढ़ना आसान लगता है = Reading Hindi seems easy to me

So in this sentence, मेरे लिए is the most straightforward choice.

Because these are adjectives that usually stay the same in this kind of usage.

Unlike adjectives such as:

• अच्छा / अच्छी / अच्छे

words like:

• आसान
• मुश्किल

often do not change for gender and number in normal modern usage.

So you can say:

• यह आसान है
• यह मुश्किल है

without changing those adjective forms.

Yes, Hindi word order is somewhat flexible, though some versions sound more natural than others.

The original sentence is very natural:

• मेरे भाई के लिए हिंदी पढ़ना आसान नहीं है, लेकिन मेरे लिए यह मुश्किल भी नहीं है।

You may also hear variations like:

• हिंदी पढ़ना मेरे भाई के लिए आसान नहीं है
• लेकिन मेरे लिए यह मुश्किल भी नहीं है

The meaning stays basically the same, but the emphasis changes depending on what comes first.

In general, the given version is a good standard model for learners.