Dit is die vraag waaroor ons praat.

dit is a pronoun meaning it or this.

die here is the definite article the.

So:

• Dit is = It is / This is
• die vraag = the question

A useful thing to remember is that Afrikaans uses die as the definite article for all genders and for both singular and plural nouns.

waaroor means about which or, in more natural English, that ... about.

So:

• die vraag waaroor ons praat
  = the question about which we are talking
  = the question we are talking about

It is the normal Afrikaans way to express a preposition like oor when it refers back to a thing.

Because it is a standard Afrikaans combination of:

• waar
  • oor = waaroor

Afrikaans often combines waar- with prepositions when referring to things:

• waarin = in which
• waarmee = with which
• waarvan = of/from which
• waarvoor = for which
• waaroor = about which

So waaroor is not accidental spelling; it is the normal form.

Not really, at least not in the way an English learner might expect.

On its own, waar often means where, but in combinations like waaroor, waarin, and waarmee, it functions more like which/what in expressions involving prepositions.

So in this sentence, waaroor does not mean something spatial like over where. It means about which.

Because waaroor ons praat is a subordinate clause, specifically a relative clause.

In Afrikaans main clauses, the finite verb usually comes early:

• Ons praat daaroor. = We are talking about it.

But in subordinate clauses, the finite verb typically goes to the end:

• die vraag waaroor ons praat

So the order waaroor ons praat is the normal Afrikaans subordinate-clause order.

Here ons means we, because it is the subject of praat.

• ons praat = we talk / we are talking

A useful point for English speakers: Afrikaans uses ons for both we and us. It does not have separate everyday forms like English does.

So:

• Ons praat. = We are talking.
• Hy sien ons. = He sees us.

Standard Afrikaans strongly prefers Dit is die vraag waaroor ons praat.

About the alternatives:

• oor wat ons praat: sometimes understandable, but not the normal standard choice here
• wat ons oor praat: not standard, because Afrikaans does not usually leave the preposition stranded at the end the way English does

English allows:

• the question we are talking about

Afrikaans normally keeps the preposition with a form like waaroor:

• die vraag waaroor ons praat

So waaroor is the best form to learn.

Because praat often combines with oor to mean talk about.

Examples:

• Ons praat oor die probleem. = We are talking about the problem.
• Waaroor praat julle? = What are you talking about?

So in your sentence, waaroor contains that same oor.

Yes.

In many contexts, dit is can be translated as either it is or this is, depending on what sounds natural in English.

So this sentence could be understood as:

• It is the question we are talking about
• This is the question we are talking about

Both are possible, depending on context.

Usually no. waaroor is used for things, ideas, topics, situations, and similar non-human referents.

If you are referring to a person after a preposition, Afrikaans normally uses wie:

• die persoon oor wie ons praat = the person we are talking about

So:

• die vraag waaroor ons praat ✅
• die persoon oor wie ons praat ✅

That is an important pattern to remember.