मेरा मकसद हिंदी सीखना है।

Because मेरा agrees with मकसद, not with I.

In Hindi, possessive words like मेरा / मेरी / मेरे change to match the gender and number of the noun they describe:

• मेरा = masculine singular
• मेरी = feminine singular
• मेरे = masculine plural, or masculine singular in some oblique contexts

Since मकसद is a masculine singular noun, the correct form is मेरा मकसद.

For comparison:

• मेरी किताब = my book
• मेरे दोस्त = my friends

मकसद is a noun meaning purpose, aim, or objective.

In this sentence, it is the main noun being described by मेरा, so मेरा मकसद means my purpose or my aim.

It is a very natural word in everyday Hindi. A more formal alternative would be उद्देश्य, and another common alternative in some contexts is लक्ष्य. But मकसद sounds normal and conversational.

सीखना is the infinitive form of the verb सीखना, meaning to learn.

The ending -ना is the usual marker of the basic dictionary form of a Hindi verb. So:

• सीखना = to learn
• करना = to do
• जाना = to go

In this sentence, सीखना works a bit like a verbal noun: learning Hindi or to learn Hindi. Hindi often uses the infinitive this way after words like मकसद.

Because Hindi usually puts the object before the verb.

So:

• हिंदी सीखना = to learn Hindi
• literally: Hindi to learn

This is normal Hindi word order. English says learn Hindi, but Hindi prefers Hindi learn.

That is part of the broader pattern that Hindi is usually subject-object-verb.

Hindi usually places the main verb or copula at the end of the sentence.

Here, है means is, and it completes the idea:

• मेरा मकसद = my purpose
• हिंदी सीखना = to learn Hindi
• है = is

So the structure is basically:

My purpose Hindi to learn is.

That sounds strange in English, but it is perfectly normal in Hindi.

It can feel like either in English.

Hindi infinitives often cover both ideas depending on context. So:

• हिंदी सीखना can be understood as to learn Hindi
• or learning Hindi

In this sentence, English would usually say My purpose is to learn Hindi, but grammatically Hindi is using the infinitive form सीखना very naturally.

Yes, you can.

Both of these are natural:

• मेरा मकसद हिंदी सीखना है।
• मेरा मकसद है हिंदी सीखना।

The version with है at the very end is a very standard neutral pattern.
The version with है earlier can sound slightly more like you are introducing the purpose and then specifying it.

Both are grammatical, and learners will hear both styles.

No. हिंदी सीखना is the normal way to say to learn Hindi.

With many direct objects in Hindi, especially things like languages, subjects, and skills, को is usually not used.

So these are natural:

• हिंदी सीखना
• अंग्रेज़ी सीखना
• गिटार सीखना

Adding को here would usually sound unnecessary or marked.

Yes. A few common alternatives are:

• मेरा उद्देश्य हिंदी सीखना है।
  More formal: My objective is to learn Hindi.

• मेरा लक्ष्य हिंदी सीखना है।
  More like my goal is to learn Hindi.

• मैं हिंदी सीखना चाहता हूँ।
  This means I want to learn Hindi, which is related but not exactly the same.
  It expresses desire, not necessarily a bigger purpose or aim.

So मकसद is specifically about purpose/aim, while चाहता हूँ is about wanting.

A simple pronunciation guide is:

meraa maqsad hindii siikhnaa hai

A few helpful notes:

• मेरा = meh-raa
• मकसद = muk-sud or maq-sud, depending on accent
• हिंदी = hin-dii
• सीखना = seekh-naa
• है = hai

A few sound tips:

• ख in सीखना is an aspirated k sound, not the English kh in names like Khan, though English speakers often approximate it that way.
• ी is a long ee sound.
• है is often pronounced something close to hai, though in fast speech it may sound a bit shorter.

If you say it smoothly as meraa maqsad hindii siikhnaa hai, you will be very understandable.