Nedves úton nagyon könnyű megcsúszni.

Because úton is the noun út + the ending -on, which means on.

• út = road, way
• úton = on a road / on the road

Hungarian often uses case endings where English uses prepositions. So instead of saying a separate word for on, Hungarian attaches that meaning to the noun.

Because nedves is describing the noun út directly, so it is an adjective: wet road.

• nedves út = wet road
• nedves úton = on a wet road

nedvesen would be an adverb meaning wetly, which would not fit here.

In Hungarian, adjectives usually do not agree with the noun in case or number when they are used directly before it.

So:

• nedves út = wet road
• nedves úton = on a wet road
• nedves utak = wet roads
• nedves utakon = on wet roads

Notice that nedves stays the same. The noun carries the ending.

Because könnyű is an adjective meaning easy, and here Hungarian is using the pattern:

valami könnyű + infinitive
= it is easy to do something

So:

• könnyű megcsúszni = it is easy to skid / easy to slip

By contrast:

• könnyen is an adverb meaning easily

For example:

• Könnyen megcsúszik. = He/She/It skids easily.

But in your sentence, the meaning is not to skid easily in an adverbial sense; it is the impersonal idea it is easy to skid, so könnyű is correct.

Hungarian usually does not need a dummy subject like English it.

English says:

• It is very easy to skid.

Hungarian simply says:

• Nagyon könnyű megcsúszni.

The sentence is complete without a subject. This is very normal in Hungarian.

Megcsúszni means to slip, to skid, or to lose traction, depending on context.

In a sentence about roads, it usually suggests skidding, especially with a vehicle, bicycle, or even a person losing footing on a slippery surface.

So in this sentence, the meaning is roughly:

• to skid
• to slip
• to slide unintentionally

The exact English choice depends on the translation you were given.

The prefix meg- often gives a sense of an action being completed, sudden, or reaching a result.

Compare:

• csúszni = to slide, to be sliding
• megcsúszni = to slip/skid, to suddenly lose grip

In many verbs, meg- does not translate as a separate English word, but it changes the meaning of the verb in an important way.

Here it helps make the verb sound like a distinct event: not just sliding, but slipping/skidding.

Because Hungarian uses the infinitive after könnyű in this kind of construction.

• megcsúszni = to slip / to skid

So the structure is:

• nagyon könnyű megcsúszni
• literally: very easy to slip

This works much like English to + verb.

It can mean a general situation, not only one specific road.

So Nedves úton nagyon könnyű megcsúszni can naturally mean:

• on a wet road
• on wet roads
• when the road is wet

Hungarian often uses the singular for general statements where English might prefer a plural.

Hungarian word order is flexible, but it is strongly connected to topic and focus.

Here:

• Nedves úton sets the scene: on a wet road / on wet roads
• nagyon könnyű gives the main comment: it is very easy
• megcsúszni completes the idea: to skid / slip

So the sentence feels natural as:

• As for wet roads, it is very easy to skid.

Other word orders are possible, but they may shift emphasis.

Yes, that is also grammatical.

The difference is mainly emphasis and information flow:

• Nedves úton nagyon könnyű megcsúszni.
  Starts with the condition/location: on wet roads

• Nagyon könnyű megcsúszni nedves úton.
  Starts with the main statement: it is very easy to skid

Both are natural. The original version highlights the road condition first.

Because nagyon means very, and it modifies adjectives and adverbs.

So:

• könnyű = easy
• nagyon könnyű = very easy

This is the normal position in Hungarian: the intensifier comes before the word it modifies.

úton is pronounced roughly OO-ton, but with a long oo sound at the start.

A few key points:

• ú is a long vowel, like a held oo
• o is shorter and more rounded than English o
• stress is on the first syllable: Ú-ton

So the first syllable is the strongest one.

It can refer to either, depending on context.

Because megcsúszni can describe:

• a car skidding
• a bicycle slipping
• a person losing footing

However, with nedves úton (on a wet road), many learners will first think of traffic or vehicles. The broader idea is simply losing grip on a wet surface.