Am Satzende setze ich immer einen Punkt.

Am is a contraction of an dem.

So:

• an = a preposition that can mean at, on, or by, depending on context
• dem = the in the dative case

So am Satzende literally means at the sentence end, or more naturally, at the end of the sentence.

Because Am Satzende comes first in the sentence.

In German main clauses, the finite verb must be in second position. This is often called the V2 rule.

So the structure is:

• Am Satzende = position 1
• setze = position 2
• ich = comes after the verb

That is why you get:

• Am Satzende setze ich immer einen Punkt.

If you start with ich, then you would say:

• Ich setze am Satzende immer einen Punkt.

Both are correct.

Because German very often forms compound nouns.

Here:

• der Satz = sentence
• das Ende = end

Together they form:

• das Satzende = the end of the sentence

This is extremely normal in German. English often uses several words where German prefers one compound word.

Because it is a noun.

In German, all nouns are capitalized, not just at the beginning of a sentence.

So both of these are capitalized because they are nouns:

• Satzende
• Punkt

Because Punkt is the direct object of setze, so it is in the accusative case.

• der Punkt = nominative
• einen Punkt = accusative

The speaker is putting or placing a period, so Punkt is the thing being acted on.

That is why you get:

• Ich setze einen Punkt.

Yes, and that is exactly the idea here.

setzen literally means to set, to place, or to put. In this sentence, it is used in the sense of putting a period at the end.

So the sentence is very close to:

• At the end of the sentence, I always put a period.

This is natural German.

Depending on context, Germans might also say things like:

• einen Punkt machen
• einen Punkt setzen

But einen Punkt setzen is perfectly normal.

Immer means always, and its position is fairly natural here.

In this sentence:

• Am Satzende setze ich immer einen Punkt.

immer comes before the object einen Punkt. That placement sounds normal and idiomatic.

German word order for adverbs like immer can vary a bit depending on emphasis, but this version is very standard.

For example, these are also possible, with different emphasis:

• Ich setze immer am Satzende einen Punkt.
• Ich setze am Satzende immer einen Punkt.

The original sentence sounds neutral and clear.

It is dative, because this phrase describes a location, not a direction.

The preposition an is a two-way preposition:

• accusative for direction or movement toward something
• dative for location or position

Here, am Satzende means at the end of the sentence, which is a location, so German uses the dative:

• an dem Satzende → am Satzende

Yes, absolutely.

These are both correct:

• am Satzende
• am Ende des Satzes

They mean basically the same thing:

• at the end of the sentence

The first uses a compound noun:

• das Satzende

The second uses a more expanded structure:

• das Ende des Satzes = the end of the sentence

German often allows both styles.

In this sentence, yes.

Der Punkt can mean:

• dot
• point
• period / full stop

Here it clearly means the punctuation mark at the end of a sentence, so in English that would be:

• period in American English
• full stop in British English

More or less, yes:

• Am Satzende = at the end of the sentence
• setze ich = I put
• immer = always
• einen Punkt = a period

A fairly literal version would be:

• At the end of the sentence, I always put a period.

That is close to the German structure and helps show how the sentence works grammatically.

Yes — it shows several very common German patterns all at once:

1. A prepositional phrase in first position

   • Am Satzende

2. Verb-second word order

   • setze comes right after the first element

3. A compound noun

   • Satzende

4. Accusative direct object

   • einen Punkt

5. Capitalized nouns

   • Satzende, Punkt

So even though the sentence is short, it is a very useful example of core German grammar.