Tu capacidad crece con la experiencia.

Because tu without an accent means your.
Tú with an accent means you.

So:

• tu capacidad = your ability/capacity
• tú = the person being addressed

In this sentence, Spanish needs the possessive adjective your, so tu is correct.

Because the subject of the sentence is tu capacidad, not tú.

In other words:

• Tu capacidad = the thing that grows
• crece = grows for a third-person singular subject

Even though the sentence is about your ability, the grammatical subject is still ability, which is singular.

Crece is the third-person singular present indicative form of crecer.

A quick present-tense pattern:

• yo crezco
• tú creces
• él/ella/usted crece

Here, it matches capacidad, which is singular, so crece is the right form.

A useful detail: crecer is only irregular in the yo form (crezco). In crece, it behaves regularly.

Spanish often uses the definite article with abstract nouns and general concepts more than English does.

So con la experiencia sounds natural in Spanish, even though English often just says with experience.

This does not necessarily mean one specific experience. It can refer to experience in a general sense.

Con literally means with, but here it shows a relationship like as experience comes or through having experience.

So crece con la experiencia suggests that growth happens along with experience.

Other prepositions would change the nuance:

• de la experiencia = from experience
• por la experiencia = because of experience or through experience, depending on context

In this sentence, con is the most natural choice.

It can mean both, depending on context.

In this sentence, capacidad is closer to:

• ability
• capability
• capacity to do something

It sounds broader and more general than a specific skill.

For example:

• capacidad = overall ability/capability
• habilidad = a more specific skill or knack

So this sentence is talking about your overall ability growing through experience.

Because the sentence treats ability as one general quality.

Tu capacidad means your ability/capacity as a whole.

If you used the plural, tus capacidades, the meaning would shift slightly to your abilities/capacities as multiple separate things.

Both are possible in Spanish, but the singular sounds more general and abstract here.

Yes, you could, but it changes the nuance a little.

• Tu capacidad = your overall capability or ability
• Tu habilidad = your skill, often something more specific or practical

So capacidad sounds broader, while habilidad can sound more like a learned skill.

The original sentence feels more general and natural if the idea is overall growth.

Yes. Spanish word order is flexible.

For example:

• Tu capacidad crece con la experiencia.
• Con la experiencia, tu capacidad crece.

Both are correct. The second version puts more emphasis on con la experiencia.

The original order is neutral and very natural.

The singular experiencia refers to experience as a general concept.

So:

• con la experiencia = with experience / as one gains experience

If you say las experiencias, you are thinking of separate individual experiences:

• con las experiencias = with the experiences / through specific experiences

The singular is more natural when talking about experience in a broad, abstract way.

In most of Latin America, crece is pronounced roughly like KREH-seh.

A few pronunciation notes:

• c before e sounds like s in most Latin American Spanish
• stress falls on the first syllable: CRE-ce
• capacidad is roughly kah-pah-see-DAHD
• experiencia is roughly eks-peh-ree-EN-see-ah

So the full sentence is approximately:

too kah-pah-see-DAHD KREH-seh kon lah eks-peh-ree-EN-see-ah

Not if you want to keep the meaning your ability.

• Tu capacidad crece con la experiencia = Your ability grows with experience
• La capacidad crece con la experiencia = Ability grows with experience or Capacity grows with experience

Without tu, the sentence becomes more general and no longer directly refers to your ability.