La evidencia confirma el hecho.

Because evidencia is a feminine singular noun, so it takes la.
Hecho is a masculine singular noun, so it takes el.

• la evidencia
• el hecho

This is a basic gender agreement pattern in Spanish: the article must match the noun in gender and number.

Confirma is the third-person singular present indicative form of the verb confirmar.

The subject is la evidencia, which is singular, so the verb must also be singular:

• yo confirmo
• tú confirmas
• él / ella / usted confirma

So La evidencia confirma... means that the evidence confirms...

Because el hecho is a direct object, and it is not a person.

In Spanish, the personal a is normally used before specific human direct objects:

• Veo a María.
• Conozco a tu hermano.

But here, el hecho is a thing, not a person, so there is no a:

• La evidencia confirma el hecho.

Often yes, but you should be a little careful.

In many contexts, evidencia does mean evidence, especially in formal or academic language. However, in everyday Spanish, especially in some contexts, prueba or pruebas can sound more natural when talking about proof or supporting material.

So:

• evidencia = evidence
• prueba / pruebas = proof, evidence, supporting proof

Depending on context, a Spaniard might also say:

• Las pruebas confirman el hecho.

That said, La evidencia confirma el hecho is perfectly grammatical and understandable.

Here, hecho is a noun meaning fact.

So el hecho = the fact.

This word can be confusing because hecho is also the past participle of hacer:

• He hecho la cena. = I have made dinner.

But in your sentence, it is not part of a verb form. It is simply a noun:

• el hecho = the fact

Yes. Historically and grammatically, hecho is the past participle of hacer, and it is also used as a noun.

So Spanish has:

• hacer = to do / to make
• hecho = done / made
• el hecho = the fact

This is very common in Spanish: a participle can become a noun over time.

This is the most neutral and standard Spanish word order:

subject + verb + direct object

• La evidencia = subject
• confirma = verb
• el hecho = direct object

Spanish word order is more flexible than English, but this version sounds straightforward and natural.

Yes, but changing it usually changes the focus or emphasis.

For example:

• La evidencia confirma el hecho.
  Neutral statement.

• El hecho lo confirma la evidencia.
  More emphasis on the fact.

• La evidencia lo confirma.
  Lo replaces el hecho.

Spanish often moves things around for emphasis, but the original sentence is the clearest basic form for learners.

Spanish often uses definite articles more freely than English does.

Here, la evidencia and el hecho both refer to something identifiable in context:

• la evidencia = the evidence
• el hecho = the fact

If you remove the articles, the sentence becomes less natural or changes meaning. In this sentence, the articles help make it sound complete and specific.

Yes, if you are talking about several pieces of evidence:

• Las evidencias confirman el hecho.

But in actual Spanish, especially natural usage, many speakers would prefer:

• Las pruebas confirman el hecho.

So the singular in your sentence treats evidence more like a collective or abstract idea.

It is natural and correct, but it sounds a bit formal or academic.

You might see or hear it in:

• reports
• essays
• journalism
• legal or scientific contexts

In everyday conversation, people might choose something slightly more common, such as:

• Las pruebas lo confirman.
• La evidencia lo demuestra.

So the sentence is good Spanish, just not especially casual.

They are similar, but not identical.

• confirmar = to confirm
  It supports or verifies something that is already proposed or known.

• demostrar = to prove / demonstrate
  It more strongly shows that something is true.

So:

• La evidencia confirma el hecho
  The evidence confirms the fact.

• La evidencia demuestra el hecho
  The evidence proves the fact.

In some contexts, demuestra sounds stronger than confirma.

In standard Spain Spanish, it is pronounced roughly like:

eh-bee-DEN-thya

A few useful points:

• The stress is on den: eviDENcia
• In most of Spain, c before i is pronounced like th in think
• So -cia sounds like thya

Likewise:

• confirma → kon-FEER-ma
• hecho → EH-cho

In hecho, the h is silent, and ch sounds like English ch in chair.