Gölete yaklaşırken dikkatli olmakta fayda var, çünkü çimen yağmurdan sonra kaygan oluyor.

Because yaklaşmak usually takes the dative case when it means to approach something.

• gölet = pond
• gölete = to/toward the pond

So:

• gölete yaklaşmak = to approach the pond

This is very common in Turkish with verbs of motion or direction.

Yaklaşırken comes from the verb yaklaşmak = to approach.

The form -ken means while / when, and in this kind of verb form it attaches to a stem like yaklaşır-:

• yaklaşır
• yaklaşırken

So gölete yaklaşırken means:

• while approaching the pond
• as you approach the pond
• sometimes simply when approaching the pond

In natural English, the best translation depends on context, but all of those are close.

Turkish often expresses while doing X by attaching a suffix directly to the verb instead of using a separate word like English does.

So instead of saying something like while you approach the pond, Turkish can compress that idea into one word:

• yaklaşırken

This is very normal and very common in Turkish.

Literally, it means something like:

• There is benefit in being careful

But in natural English, it usually means:

• It’s a good idea to be careful
• You should be careful
• It’s wise to be careful

This is a very common Turkish pattern for giving advice in a softer, less direct way.

In this sentence, -makta fayda var is part of a very common fixed expression:

• X yapmakta fayda var = it’s a good idea to do X
• X yapmakta yarar var = same idea

So dikkatli olmakta fayda var is an idiomatic way to say it’s advisable to be careful.

Although -makta can have other grammatical uses in Turkish, here it is best learned as part of the whole pattern ...makta fayda var.

Turkish often leaves out the subject when it is understood from context.

Here, the sentence is giving general advice, so the hidden subject is something like:

• you
• one
• people in general

So dikkatli olmakta fayda var does not need an explicit subject. Turkish is very comfortable with this kind of omission.

The postposition sonra normally takes the ablative case.

So:

• yağmur = rain
• yağmurdan = from/after rain
• yağmurdan sonra = after the rain / after rain

This pattern is very important:

• dersten sonra = after class
• işten sonra = after work
• yemekten sonra = after the meal

So yağmurdan sonra is completely regular.

Not necessarily. In Turkish, çimen can be used as a general or collective noun, much like English grass.

So:

• çimen = grass / lawn / grassy ground

It does not have to be plural to refer to grass in general. Turkish often uses singular nouns where English learners might expect a plural.

This is a very good question, because the choice affects the nuance.

• kaygandır sounds more like a direct descriptive statement: it is slippery
• kaygan olur sounds more general or habitual: it becomes/is slippery
• kaygan oluyor often suggests a condition that happens in practice or as a result of something: it gets slippery / tends to get slippery

In this sentence, yağmurdan sonra kaygan oluyor feels very natural because it describes what happens after rain: the grass ends up getting slippery.

So oluyor makes the statement sound a bit more immediate and observational.

Çünkü means because.

It introduces the reason for the advice:

• Gölete yaklaşırken dikkatli olmakta fayda var = It’s a good idea to be careful when approaching the pond
• çünkü çimen yağmurdan sonra kaygan oluyor = because the grass gets slippery after rain

So the second clause explains why being careful is a good idea.

Yes, the word order is natural.

Turkish often puts a time or situation clause first, so starting with gölete yaklaşırken feels very normal. It sets the scene before the main advice.

The sentence structure is roughly:

• When approaching the pond,
• it’s a good idea to be careful,
• because the grass gets slippery after rain.

Some word order changes are possible in Turkish, but this version sounds smooth and standard.