Tio estas bona maniero helpi.

Tio usually means that or that thing/that matter. In this sentence, it points to some idea, action, or situation already being discussed.

Why not the others?

• ĝi = it, usually for a specific noun already mentioned
• ĉi tio = this, something near the speaker or more immediate
• tio = that, often a more general reference

So Tio estas bona maniero helpi is a natural way to say That is a good way to help.

Estas is the present-tense form of esti, which means to be.

So:

• mi estas = I am
• ĝi estas = it is
• tio estas = that is

In this sentence, estas simply links tio with bona maniero helpi. It works just like is in English.

Esperanto uses la for the, but it has no separate word for a/an.

So:

• la maniero = the way
• maniero = a way or just way, depending on context

Here, bona maniero means a good way, so no article is needed.

Because bona is an adjective, and it describes the noun maniero.

In Esperanto:

• -a = adjective
• -o = noun
• -e = adverb

So:

• bona = good
• bono = goodness, the good
• bone = well

Since maniero is a noun and bona describes it, bona is the correct form.

Because this noun is not a direct object. It is part of the predicate after estas.

A very important rule is that after esti (to be), the complement normally does not take -n.

So:

• Tio estas bona maniero. = That is a good way.
• not Tio estas bona manieron.

The -n ending is mainly for direct objects or for showing movement toward something, and neither applies here.

Helpi is the infinitive form, meaning to help.

After a noun like maniero (way, method, manner), Esperanto often uses a bare infinitive to show what the way is for.

So:

• maniero helpi = a way to help
• tempo manĝi = time to eat
• io fari = something to do

This is a very normal Esperanto structure.

Yes, you can, but the version without por is often more direct and idiomatic here.

Compare:

• bona maniero helpi = a good way to help
• bona maniero por helpi = also understandable, and sometimes used

However, learners often overuse por because English uses to in many different ways. In Esperanto, a bare infinitive after a noun is often enough.

So the original sentence is simple and very natural.

Usually no, not in this sentence.

De often means of/from, and it is not the normal choice before an infinitive here. Esperanto prefers:

• maniero helpi = a way to help
• sometimes maniero por helpi = a way in order to help

But maniero de helpi is generally not the standard way to express this idea.

If you want a noun-like form, you could say something like:

• bona maniero de helpado = a good method of helping

But that is a different structure.

Yes. The sentence is general, so no object is stated, but you can add one if you want.

For example:

• Tio estas bona maniero helpi aliajn. = That is a good way to help others.
• Tio estas bona maniero helpi infanojn. = That is a good way to help children.

So helpi works just like any other verb in the infinitive: it can still take its own object.

The given word order is the most natural one:

• Tio = subject
• estas = verb
• bona maniero helpi = complement

Esperanto word order is fairly flexible, but not all changes sound equally natural. For example, the adjective normally comes before the noun here:

• bona maniero = good way

You could rearrange the whole sentence for emphasis, but the original version is the plain, standard way to say it.