हम आपस में मदद करते हैं।

In this sentence, हम means we.

Hindi also sometimes uses हम for I in some regional varieties or very formal/royal speech, but in standard everyday Hindi, with the verb करते हैं, it clearly means we.

आपस में means among ourselves, with each other, or mutually.

It shows that the action happens between the people in the group. So हम आपस में मदद करते हैं has the sense of we help each other, not just we help in a general way.

A useful way to remember it:

• आपस = mutual/one another
• में = in/among

Together, they give the idea of interaction within the group.

In Hindi, आपस is usually used with the postposition में to express the idea of among each other or between themselves.

So:

• आपस में बात करना = to talk among themselves / to talk to each other
• आपस में लड़ना = to fight with each other
• आपस में मदद करना = to help each other

You should generally learn आपस में as a fixed expression.

Because मदद is a noun meaning help, and Hindi often uses a noun + करना structure to express actions.

So:

• मदद करना = to help
• literally, something like to do help

This is extremely common in Hindi. Other examples:

• काम करना = to work / to do work
• सफ़र करना = to travel
• कोशिश करना = to try
• बात करना = to talk

So मदद करते हैं means help in the verbal sense.

Because the subject is हम = we, and in the normal habitual present, the verb agrees with the gender/number of the subject.

With हम, the masculine plural/default form is करते.

So:

• हम मदद करते हैं = we help
• हम मदद करती हैं = we help, if the speakers are all female

In mixed groups, or when gender is unspecified, Hindi usually uses the masculine plural form करते.

हैं is the present-tense form of to be used with plural subjects and also with the polite you (आप).

In the habitual present, Hindi often uses:

• verb stem + habitual ending + form of होना

So:

• मैं करता हूँ = I do
• तुम करते ho = you do
• वह करता है = he does
• हम करते हैं = we do
• वे करते हैं = they do

So करते हैं matches the subject हम.

Yes. It is the habitual present.

हम आपस में मदद करते हैं usually means:

• we help each other
• we do help each other
• we help one another regularly / as a general fact

It does not usually mean we are helping each other right now.

If you want the ongoing action, Hindi would normally use:

• हम आपस में मदद कर रहे हैं। = We are helping each other.

Yes, absolutely. हम एक-दूसरे की मदद करते हैं is very common and natural.

Both expressions can mean we help each other:

• हम आपस में मदद करते हैं
• हम एक-दूसरे की मदद करते हैं

There is a small structural difference:

• आपस में मदद करना = to help mutually / among ourselves
• एक-दूसरे की मदद करना = to help one another, literally to help each other’s [need/help relationship]

Both are correct, but many learners hear एक-दूसरे की मदद करना very often in everyday Hindi.

Because मदद करना does not require को in this structure.

Hindi does not always mark objects the way English does, and many expressions have to be learned as chunks. With मदद करना, it is common to say:

• मैं उसकी मदद करता हूँ। = I help him/her.
• हम आपस में मदद करते हैं। = We help each other.

You may also hear की मदद करना in structures like:

• हम एक-दूसरे की मदद करते हैं।

So the grammar depends on the exact expression being used, not on a single English-style rule.

The basic Hindi word order here is:

हम — subject
आपस में — adverbial phrase
मदद — noun
करते हैं — verb phrase

Hindi usually puts the main verb at the end, so this is very normal.

A literal breakdown is something like:

• we
• among ourselves
• help
• do

That is why the sentence ends with करते हैं.

Yes, sometimes the position can shift a little, but it usually stays before the main verb phrase.

Common and natural:

• हम आपस में मदद करते हैं।

Also possible depending on emphasis:

• हम मदद आपस में करते हैं।

But for learners, हम आपस में मदद करते हैं is the safest and most natural order to use.

Then the habitual participle would usually be feminine plural:

• हम आपस में मदद करती हैं।

So:

• mixed group / masculine/default: हम आपस में मदद करते हैं।
• all-female group: हम आपस में मदद करती हैं।

The rest of the sentence stays the same.

It is neutral and natural Hindi.

It can be used in everyday conversation, writing, or general statements. It is not especially formal, and it is not slangy either.

So it is a good standard sentence pattern to learn:

• हम आपस में काम करते हैं।
• हम आपस में बात करते हैं।
• हम आपस में मदद करते हैं।