Könnyű eltévedni a ködben.

Because könnyű is the main predicate here: easy. Hungarian often starts with the most important information, and in a sentence like this the structure is basically:

Könnyű + infinitive

So Könnyű eltévedni means It is easy to get lost.

Starting with könnyű is the most neutral and natural way to say it. You could also say A ködben könnyű eltévedni, which puts more emphasis on in the fog.

Because after adjectives like könnyű and nehéz, Hungarian commonly uses an infinitive.

So:

• Könnyű eltévedni. = It is easy to get lost.
• Nehéz megérteni. = It is hard to understand.

This works much like English easy to do.

The ending -ni marks the infinitive:

• eltéved = he/she gets lost
• eltévedni = to get lost

Eltévedni comes from:

• tévedni = to be mistaken, to go astray
• el- = a verbal prefix

Together, eltévedni means to get lost.

The prefix el- often gives a sense of movement away, completion, or ending up in a different state. In this verb, it helps create the meaning of losing one’s way.

So learners often remember:

• tévedni = to be mistaken / wander wrongly
• eltévedni = to get lost

Hungarian does not need a dummy subject like English it in this kind of sentence.

English says:

• It is easy to get lost.

Hungarian simply says:

• Könnyű eltévedni.

So the idea of it is is expressed without any extra subject word. This is very normal in Hungarian.

A ködben breaks down like this:

• a = the
• köd = fog
• -ben = in

So:

• köd = fog
• ködben = in the fog
• a ködben = in the fog

The ending -ban/-ben is the inessive case, used for being inside something.

Examples:

• a házban = in the house
• a vízben = in the water
• a ködben = in the fog

Hungarian vowel harmony decides which version of the ending is used.

• Words with back vowels usually take -ban
• Words with front vowels usually take -ben

Köd has the front vowel ö, so it becomes:

• ködben

Compare:

• házban = in the house
• kertben = in the garden
• ködben = in the fog

Hungarian usually prefers the article here: a ködben = in the fog.

Even when speaking generally, Hungarian often uses the definite article with nouns in expressions like this, especially when referring to a situation or environment that feels concrete.

So Könnyű eltévedni a ködben sounds natural and idiomatic.

Without the article, ködben, it might still appear in some contexts, but a ködben is the standard form in a sentence like this.

Yes. Hungarian word order is flexible, and changing it usually changes emphasis rather than basic meaning.

For example:

• Könnyű eltévedni a ködben.
  Neutral: It’s easy to get lost in the fog.

• A ködben könnyű eltévedni.
  Emphasizes in the fog.

• Eltévedni könnyű a ködben.
  More marked; it highlights getting lost.

So the original sentence is a very natural neutral version.

Yes, absolutely. That is also a very natural sentence.

It means roughly: One can easily get lost in the fog / It’s easy to get lost in the fog.

There is a small structural difference:

• Könnyű eltévedni a ködben.
  Literally: To get lost in the fog is easy.

• Könnyen el lehet tévedni a ködben.
  Literally: One can get lost easily in the fog.

So:

• könnyű = easy (adjective)
• könnyen = easily (adverb)

Both are correct, but the original sentence uses the adjective pattern.

A learner may find this word tricky because it has sounds that do not exist in English.

Very roughly:

• ö is like a front rounded vowel, somewhat similar to the vowel in German schön
• ny sounds like Spanish ñ in señor
• ű is a long front rounded vowel

So könnyű is approximately pronounced:

køɲːyː

You do not need perfect IPA to learn it, but two things matter a lot:

1. ny is one sound, not n + y
2. ű is long, so it should be held a little longer than a short vowel

It is general and impersonal.

It does not mean:

• I get lost in the fog
• You get lost in the fog
• He gets lost in the fog

Instead, it means something like:

• People can easily get lost in the fog
• It is easy to get lost in the fog

This is a very common Hungarian way to make general statements with an infinitive.