Se vi volas sukcesi, vi devas lerni ne nur el libroj, sed ankaŭ el sperto.

Se means if and introduces a condition. So Se vi volas sukcesi means If you want to succeed.

It works very much like English if:

• Se pluvas, mi restos hejme. = If it rains, I will stay home.
• Se vi studas, vi progresas. = If you study, you progress.

After volas (want), Esperanto uses the infinitive form of the next verb.

• voli = to want
• sukcesi = to succeed

So:

• vi volas sukcesi = you want to succeed

You do the same with many verbs:

• Mi volas lerni. = I want to learn.
• Ŝi volas veni. = She wants to come.

Sukcesas would be a finite verb form, meaning succeeds / are succeeding, so it would not fit after volas here.

In Esperanto, the infinitive already includes the idea of English to. The infinitive ending is -i.

So:

• sukcesi = to succeed
• lerni = to learn
• voli = to want
• devi = to have to / must

That means Esperanto does not need a separate word for to before infinitives.

Devas comes from devi, meaning must, have to, or be required to.

So:

• vi devas lerni = you must learn / you have to learn

Just like with volas, devas is followed by an infinitive:

• Mi devas iri. = I must go.
• Ni devas labori. = We have to work.

El usually means out of or from, and in this sentence it means from in the sense of learning from a source.

So:

• lerni el libroj = learn from books
• lerni el sperto = learn from experience

This is a common Esperanto pattern:

• el libro = from a book
• el historio = from history
• el eraroj = from mistakes

Libroj is plural because it means books in general, while sperto is singular because it means experience as a general idea, much like uncountable experience in English.

• libro = book
• libroj = books
• sperto = experience

So:

• el libroj = from books
• el sperto = from experience

If you wanted to talk about specific experiences, you might use the plural spertoj, but here the singular is the natural choice.

This is a very common Esperanto structure meaning not only ... but also ...

In the sentence:

• ne nur el libroj, sed ankaŭ el sperto

This means:

• not only from books, but also from experience

You can use this structure with many kinds of words:

• Li estas ne nur inteligenta, sed ankaŭ afabla. = He is not only intelligent, but also kind.
• Mi ne nur legis, sed ankaŭ skribis. = I not only read, but also wrote.

In the standard full pattern, yes: ne nur ... sed ankaŭ ...

That is the clearest and most balanced form:

• ne nur A, sed ankaŭ B = not only A, but also B

Sometimes in real usage people may shorten things, but for learners it is best to remember the complete pattern.

Vi can mean both you singular and you plural.

So it can mean:

• one person: you
• several people: you all

Esperanto does not normally distinguish them in everyday use. Context tells you which is meant.

The comma separates the conditional clause from the main clause.

• Se vi volas sukcesi, = If you want to succeed,
• vi devas lerni ... = you must learn ...

This is similar to English punctuation, where a comma is often used after an opening if clause.

Yes, Esperanto word order is fairly flexible, but the original order is the most natural and clear.

The sentence:

• Se vi volas sukcesi, vi devas lerni ne nur el libroj, sed ankaŭ el sperto.

is straightforward and idiomatic.

You can sometimes move parts for emphasis, but beginners should usually keep the standard order:

1. condition
2. subject
3. verb
4. other elements

That makes the sentence easy to understand.

The accusative -n is mainly used for a direct object or for motion toward something.

In this sentence:

• sukcesi does not take a direct object
• lerni is followed by prepositional phrases: el libroj and el sperto

Because libroj and sperto come after the preposition el, they do not take -n.

So:

• el libroj is correct
• el sperto is correct

Not:

• el librojn
• el sperton

Yes. Sukcesi is the verb to succeed.

That may feel a little different to English learners because English often uses expressions like be successful, but Esperanto commonly uses the verb directly:

• Mi sukcesis. = I succeeded.
• Ŝi volas sukcesi. = She wants to succeed.

There is also the related adjective:

• sukcesa = successful

So Esperanto can express both ideas:

• sukcesi = to succeed
• esti sukcesa = to be successful