Ĉi tiu strategio estas simpla.

In Esperanto, nouns normally end in -o. So strategio means strategy.

This makes parts of speech very easy to recognize:

• -o = noun
• -a = adjective
• -e = adverb
• -i = infinitive verb

So when you see strategio, you can immediately tell it is a noun.

Because simpla is an adjective, and adjectives in Esperanto end in -a.

So:

• simpla = simple
• bona = good
• granda = big

This -a ending is required for adjectives, even when the root looks similar to an English word.

Estas is the present-tense form of the verb esti, meaning to be.

So:

• mi estas = I am
• vi estas = you are
• ĝi estas = it is

In Ĉi tiu strategio estas simpla, estas links the subject (this strategy) with the description (simple), just like is in English.

Ĉi tiu means this.

It is made of:

• tiu = that / that one
• ĉi = a particle that brings the meaning closer, giving the idea of this

So:

• tiu strategio = that strategy
• ĉi tiu strategio = this strategy

Esperanto also allows tiu ĉi, which means the same thing. So both of these are correct:

• Ĉi tiu strategio estas simpla.
• Tiu ĉi strategio estas simpla.

Esperanto does have a definite article: la.

So you could say:

• La strategio estas simpla. = The strategy is simple.

But ĉi tiu already identifies the noun very clearly as this strategy, so la is not needed here.

In fact, you normally would not say la ĉi tiu strategio. Ĉi tiu already does the job of pointing out which strategy you mean.

Yes. In Esperanto, adjectives agree with the nouns they describe.

Here:

• strategio is singular
• simpla is also singular

If the noun were plural, the adjective would also become plural:

• Ĉi tiuj strategioj estas simplaj. = These strategies are simple.

So adjective agreement is an important rule in Esperanto.

A rough pronunciation guide is:

chee TEE-oo strate-GEE-o ESS-tahs SEEM-plah

A few useful details:

• ĉ sounds like ch in church
• j usually sounds like y in yes
• g is always hard, like in go
• each vowel is pronounced clearly:
  • a = ah
  • e = eh
  • i = ee
  • o = oh
  • u = oo

Also, Esperanto stress normally falls on the second-to-last syllable:

• stra-te-GI-o
• SIM-pla
• ES-tas

The normal and clearest order is:

Ĉi tiu strategio estas simpla.

That is:

• subject: Ĉi tiu strategio
• verb: estas
• adjective/complement: simpla

Esperanto word order is somewhat flexible, but this standard order is the best choice for learners and for ordinary statements.

For emphasis, some rearrangement is possible in Esperanto, but in a simple sentence like this, the standard order is the most natural.

Yes, but it would mean That strategy is simple, not This strategy is simple.

Compare:

• Ĉi tiu strategio estas simpla. = This strategy is simple.
• Tiu strategio estas simpla. = That strategy is simple.

So the presence of ĉi is what changes that to this.

Because the sentence is not using a dummy subject like English sometimes does. Esperanto directly states the subject:

• Ĉi tiu strategio = this strategy
• estas simpla = is simple

So Esperanto does not need an extra it here. The subject is already clearly named.

Yes. In Esperanto, adjectives can come before or after the noun, though before is more common in ordinary descriptions.

So:

• simpla strategio = a simple strategy
• strategio simpla = a strategy simple / a simple strategy

But in your sentence, simpla is not directly attached to the noun inside a noun phrase. It comes after estas, so it is acting as a predicate adjective:

• Ĉi tiu strategio estas simpla. = This strategy is simple.

That is why the structure is different from a simple strategy.