qǐng tíng zài zhèlǐ.

Yes. In this sentence, 请 works like please and makes the instruction more polite.

So:

请停在这里。 = Please stop here.

By itself, 请 can also mean to invite or to request, but in this sentence its job is simply to soften the command.

Mandarin often leaves out the subject when it is obvious from context.

If you are speaking to a driver, listener, or anyone already involved in the situation, you do not need to say 你 or 您. So 请停在这里。 is perfectly natural.

You could say:

请你停在这里。
or
请您停在这里。

But that is more explicit, and often unnecessary.

Here, 在 introduces the location of the stopping. It is roughly like at/in/on depending on context, but in this sentence the simplest idea is:

停在这里 = stop here / stop at this place

English can say stop here without a preposition, but Chinese normally uses 在 in this pattern.

Because Mandarin usually needs 在 + place after the verb in this kind of expression.

So:

• 停在这里 = natural
• 停这里 = not standard Mandarin

This is part of a common pattern:

• 坐在椅子上 = sit on the chair
• 放在桌子上 = put it on the table
• 停在这里 = stop here

Yes, you can. 请在这里停 is understandable and natural.

The two versions are very close:

• 请停在这里 emphasizes the action together with its stopping location.
• 请在这里停 puts 在这里 earlier, so here gets a little more attention.

For a learner, 请停在这里 is a very good standard pattern to remember.

Usually not in the same flexible way as English.

In Mandarin, 请 most naturally goes before the verb:

请停在这里。

A sentence-final please-type feeling is often expressed in other ways, such as:

• 在这里停一下吧。
• 麻烦在这里停一下。

So if you want a direct equivalent of please in a simple sentence, putting 请 before the verb is the safest choice.

Not exactly.

• 停 = stop; come to a stop
• 停车 = stop or park a vehicle
• 停止 = stop/cease, often more formal or used for activities, processes, or actions

In this sentence, 停 is enough because the context usually makes it clear that someone is being told to stop, often a driver.

Examples:

• 请停在这里。 = Please stop here.
• 请在这里停车。 = Please park here. / Please stop the car here.
• 请停止说话。 = Please stop talking.

By itself, 请停在这里 usually suggests stop here rather than specifically park here.

If you want to clearly say park here, 请在这里停车 is more specific.

So:

• 请停在这里 = please stop here / pull over here
• 请在这里停车 = please park here

Context decides a lot.

They both mean here.

• 这里 is standard and widely used everywhere.
• 这儿 is more colloquial and especially common in northern Mandarin.

So these are both possible:

• 请停在这里。
• 请停在这儿。

For learners, 这里 is often the safer form to learn first.

Carefully pronounced, it is zhèlǐ.

But in everyday speech, the second syllable is often lighter, so it may sound more like zhèli.

A few pronunciation notes:

• 请 qǐng: third tone
• 停 tíng: second tone
• 在 zài: fourth tone
• 这里 zhèlǐ / zhèli: often a full third tone in careful speech, often lighter in fast speech

So a natural rhythm is often close to:

qǐng tíng zài zhèli

You can, but you do not have to.

• 请停在这里。 = polite and natural
• 请您停在这里。 = more explicitly polite
• 请你停在这里。 = neutral, but can sound a little more direct depending on tone

If you are speaking to a stranger, customer, or someone you want to be respectful to, 请您停在这里 is a good option. But in many real situations, just 请停在这里 is already fine.