No te enfades si me equivoco; todavía estoy aprendiendo.

Because this is a negative command addressed to tú.

In Spanish, negative commands use the present subjunctive:

• No te enfades = Don’t get angry / Don’t be upset

Compare:

• Te enfadas = You get angry / You are getting angry
• No te enfades = Don’t get angry

A useful pattern:

• affirmative tú command: Enfádate
• negative tú command: No te enfades

So enfades is not describing what the person does; it is telling them what not to do.

Enfadarse means to get angry, to get annoyed, or to be upset.

It is very common in Spain. In many parts of Latin America, learners are also likely to hear:

• enojarse
• sometimes molestarse, depending on context

So in Spain, No te enfades sounds very natural.

Because enfadarse is commonly used as a pronominal verb.

The full infinitive is:

• enfadarse = to get angry

The pronoun changes depending on the person:

• me enfado = I get angry
• te enfadas = you get angry
• se enfada = he/she/you-formal gets angry

So in No te enfades, te matches tú.

Because the usual verb here is equivocarse, which means:

• to be mistaken
• to make a mistake

So:

• me equivoco = I’m mistaken / I make a mistake

Without the pronoun, equivocar usually means something different, such as to confuse or to make someone/something mistaken.

For example:

• Me equivoco = I’m wrong
• Eso me equivoca = That confuses me

So in your sentence, me is necessary.

Because after si meaning if, when you are talking about a real or possible condition, Spanish normally uses the indicative, not the subjunctive.

So:

• Si me equivoco = If I make a mistake / If I’m wrong

This is the normal pattern:

• Si llueve, no salgo = If it rains, I’m not going out
• Si tengo tiempo, te llamo = If I have time, I’ll call you

So si me equivoco is the correct form here.

Because equivoco follows normal Spanish stress rules, so it does not need a written accent.

• equivoco is stressed on the next-to-last syllable: e-qui-vo-co

Spanish usually stresses the next-to-last syllable when a word ends in a vowel, n, or s, unless an accent mark shows otherwise.

By contrast, todavía does need an accent mark because the stress falls where it would not be expected otherwise.

Here todavía means still.

So:

• todavía estoy aprendiendo = I’m still learning

It adds the idea that the learning process is not finished yet.

Depending on context, todavía can also mean yet:

• Todavía no = Not yet

Yes. In this sentence, aún and todavía are interchangeable.

Both can mean still:

• Todavía estoy aprendiendo
• Aún estoy aprendiendo

In everyday Spanish from Spain, todavía is often especially common in speech, but both are correct and natural.

Estoy aprendiendo is the present progressive, and it emphasizes that the action is ongoing right now / at this stage.

• aprendo = I learn / I am learning
• estoy aprendiendo = I am in the process of learning

In this sentence, todavía estoy aprendiendo sounds very natural because the speaker is stressing:

• this is an ongoing process
• mistakes may happen because learning is not finished

You could say todavía aprendo, but it would usually sound less natural here.

Yes. It is addressed to one person informally because it uses te and the tú command form enfades.

Versions for other situations:

• informal singular: No te enfades si me equivoco
• formal singular: No se enfade si me equivoco
• informal plural in Spain: No os enfadéis si me equivoco
• formal plural: No se enfaden si me equivoco

So the original sentence is clearly speaking to one person in an informal way.

In this sentence, the pronouns come before the conjugated verb:

• te enfades
• me equivoco

That is normal with:

• negative commands: No te enfades
• ordinary finite verbs: me equivoco

Compare negative and affirmative commands:

• No te enfades = Don’t get angry
• Enfádate = Get angry

In the affirmative command, the pronoun attaches to the end. In the negative command, it goes before the verb.

The semicolon links two closely related ideas:

• No te enfades si me equivoco
• todavía estoy aprendiendo

It shows a pause stronger than a comma, but not as final as a full stop.

You could also write:

• No te enfades si me equivoco, todavía estoy aprendiendo.
• No te enfades si me equivoco. Todavía estoy aprendiendo.

All are understandable, but the semicolon gives the sentence a slightly more careful written style.

It can mean both, depending on context.

• Si me equivoco can mean If I make a mistake
• It can also mean If I’m wrong

In this sentence, both ideas fit well:

• the speaker might say something incorrect
• the speaker might make an error because they are still learning

That is why equivocarse is a very useful word in Spanish.