
es
it
Serves as a substitute (pronoun) for a single neuter noun, both in the nominative and in the accusative.
Das ist mein neues Fahrrad. Es war ziemlich teuer.
That is my new bicycle. It was pretty expensive.
it
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it
Serves as a substitute (pronoun) for a single neuter noun, both in the nominative and in the accusative.
Das ist mein neues Fahrrad. Es war ziemlich teuer.
That is my new bicycle. It was pretty expensive.

it
Used as an impersonal subject to describe general conditions, the weather, the time, or sensory perceptions, without referring to a specific person or thing.
Beeil dich, es wird schon dunkel.
Hurry up, it's already getting dark.

placeholder it
Functions as a placeholder (expletive) at the beginning of a sentence when the actual subject of the sentence comes later. This 'es' (it) drops out when another sentence element moves into the first position.
Es klopfte jemand an die Tür.
Someone knocked on the door.

it
As an object, refers to a previously mentioned or known situation, idea, or entire statement.
Sie hat den Job gekündigt, und ich kann es einfach nicht glauben.
She quit the job, and I simply can't believe it.

fixed es
Is a fixed component in certain impersonal phrases and expressions.
In diesem Wald gibt es viele seltene Pilze.
There are many rare mushrooms in this forest.
You have to distinguish between two types of 'es' (it). The placeholder 'es' at the beginning of a sentence disappears when another word is in position 1. The fixed 'es' for weather, time, or in expressions like 'es gibt' (there is/there are) must always remain in the sentence.
Es kommt ein Gast. -> Ein Gast kommt.
A guest is coming. -> A guest is coming.
The pronoun 'es' (it) replaces a neuter noun (a 'das' word). It is used to avoid repetition.
Ich habe ein neues Handy gekauft. Es hat eine sehr gute Kamera.
I bought a new phone. It has a very good camera.
For general statements about the weather, the time of day, sounds, or well-being, the impersonal 'es' (it) is used as the subject. It does not refer to a specific thing.
Es ist kalt draußen.
It's cold outside.
When the actual subject of the sentence comes later, 'es' (it) can take the first position in the sentence as a placeholder. This is often used in written or more formal language.
Es ist noch Suppe von gestern da.
There is still some soup from yesterday.
'Es' (it) can refer to the content of an entire previous sentence or idea. In this function, 'es' summarizes a complete piece of information.
Die Prüfung war sehr schwer, aber sie hat es geschafft.
The exam was very difficult, but she managed it.
The expression 'es gibt' (there is/there are) is very common and means 'to exist'. It is important that the noun that follows is always in the accusative. This is a common mistake.
In unserer Stadt gibt es einen großen Park.
There is a large park in our city.
the / that
Both das and es can refer back to a situation that is already known. Das highlights the statement as a specific point, while es refers back to it neutrally. Use das when you want deliberate emphasis and es for an unstressed reference back.

Ich habe es schon erklärt.
I have already explained it.
Das ist genau der Punkt, den ich gemeint habe.
That is exactly the point I meant.