Szerintem a válasz jó és könnyű.

Yes. In Hungarian, a/az is the definite article, so here a válasz means the answer.

• a is used before a consonant: a válasz
• az is used before a vowel: az alma

If you want a/an in Hungarian, you usually use egy:

• egy válasz = an answer / one answer
• a válasz = the answer

So this sentence is talking about a specific answer, not just any answer.

Szerintem usually means in my opinion or according to me.

It is built from:

• szerint = according to
• -em = a suffix meaning my / me in this structure

So literally it is something like according-to-me.

Related forms:

• szerinted = in your opinion
• szerinte = in his/her opinion
• szerintünk = in our opinion
• szerintetek = in your opinion (plural)
• szerintük = in their opinion

You can also use szerint with nouns:

• Péter szerint = according to Péter

Hungarian usually omits the verb to be in the present tense, third person when the predicate is a noun or adjective.

So:

• A válasz jó. = The answer is good.
• A válasz könnyű. = The answer is easy.

There is no van here, even though English needs is.

Compare:

• Én fáradt vagyok. = I am tired.
• Te fáradt vagy. = You are tired.
• Ő fáradt. = He/she is tired.

So in third person singular, Hungarian often leaves the verb out.

But in other situations, van does appear, for example:

• A válasz itt van. = The answer is here.
• A válasz jó volt. = The answer was good.

A válasz is the subject of the sentence: the answer.

It is in the nominative form, which in Hungarian often has no special ending.

So:

• válasz = answer
• a válasz = the answer

Nothing is being done to the answer here, so there is no accusative ending like -t.

Great question. Hungarian adjectives can appear in two different roles:

1. Attributive adjective: directly before the noun

   • a jó válasz = the good answer

2. Predicate adjective: after the subject, as part of what is being said about it

   • A válasz jó. = The answer is good.

In your sentence, jó and könnyű are predicate adjectives, so they come after a válasz.

Compare:

• a jó és könnyű válasz = the good and easy answer
• A válasz jó és könnyű. = The answer is good and easy.

No. Hungarian adjectives do not agree the way they do in many Indo-European languages.

Important points:

• Hungarian has no grammatical gender
• Predicate adjectives do not change to match the noun in gender
• They also usually do not change in number in a sentence like this

So:

• A válasz jó. = The answer is good.
• A válaszok jók. = The answers are good.

In the plural, predicate adjectives often do take plural marking, as in jók, but there is still no gender agreement.

In your sentence, the subject is singular, so the plain forms jó and könnyű are used.

Because the sentence needs an adjective, not an adverb.

• könnyű = easy, light
• könnyen = easily

Here the sentence describes the answer itself, so Hungarian uses the adjective:

• A válasz könnyű. = The answer is easy.

But if you describe how something happens, you use the adverb:

• Könnyen válaszolok. = I answer easily.

So könnyű is correct because it describes válasz.

Yes. Könnyű can mean both:

• light in weight
• easy in difficulty

The meaning depends on context.

Examples:

• Ez a táska könnyű. = This bag is light.
• Ez a feladat könnyű. = This exercise is easy.

With válasz (answer), the meaning is naturally easy or perhaps simple/straightforward, not light.

The word order can change, because Hungarian word order is fairly flexible. But different orders can sound more natural, more emphatic, or more marked.

Your sentence has a very normal, neutral structure:

• Szerintem a válasz jó és könnyű.

You could also say:

• A válasz szerintem jó és könnyű.

This still means basically the same thing, but the rhythm and emphasis are slightly different.

Hungarian often uses word order to show topic and focus, not just grammar. So the original sentence is a safe, natural choice for a learner.

You may hear én szerintem in speech, but in standard Hungarian it is often felt to be redundant.

That is because szerintem already includes the idea of me / my opinion.

So usually:

• Szerintem... = In my opinion...

Adding én can sound emphatic or colloquial:

• Én szerintem ez jó. = I think this is good.

As a learner, szerintem by itself is the best default choice.

A rough pronunciation guide is:

• kö: like a rounded vowel somewhat similar to the vowel in French peu or German schön
• ny: like Spanish ñ in señor
• ű: a long rounded vowel, somewhat like a long German ü

So könnyű is approximately:

kö-nyű, with a long final vowel

A more technical pronunciation is roughly [ˈkøɲːyː].

A few useful details:

• ny is a single consonant sound
• ű is long, so hold it a bit longer than ü
• Hungarian stress is usually on the first syllable, so: KÖNnyű

És means and.

It simply joins the two adjectives:

• jó = good
• könnyű = easy
• jó és könnyű = good and easy

So the sentence says two things about the answer:

• it is good
• it is easy

Hungarian uses és much like English uses and.