Im Kurs üben wir heute den Imperativ, weil man ihn im Alltag oft hört.

German often puts a time or place expression first for emphasis or to set the scene. Here, Im Kurs means in the course / in class, so it tells you the context first.

Even when something other than the subject comes first, German still keeps the conjugated verb in second position:

• Im Kurs | üben | wir heute den Imperativ

That is why wir comes after üben.

Im is a contraction of in dem.

So:

• im Kurs = in dem Kurs

German very often uses these contractions in natural speech and writing.
A few common ones are:

• im = in dem
• am = an dem
• zum = zu dem
• zur = zu der

Because den Imperativ is the direct object of üben.

The verb üben takes an accusative object:

• Wir üben den Imperativ.

Imperativ is a masculine noun:

• nominative: der Imperativ
• accusative: den Imperativ

So here the accusative form is required.

In German, all nouns are capitalized.

So in this sentence you get:

• Kurs
• Imperativ
• Alltag

This is one of the most noticeable spelling differences from English.

German adverb placement is flexible, but there are common patterns. In the main clause, heute fits naturally after the subject:

• Im Kurs üben wir heute den Imperativ

This sounds normal and neutral.

You could also hear other versions depending on emphasis, for example:

• Heute üben wir im Kurs den Imperativ
• Im Kurs üben wir den Imperativ heute

But the original sentence is the most natural everyday wording.

Because weil introduces a subordinate clause, and in German subordinate clauses send the conjugated verb to the end.

Main clause:

• Wir üben heute den Imperativ

Subordinate clause with weil:

• weil man ihn im Alltag oft hört

This is a core German word-order rule:

• main clause: verb usually in second position
• subordinate clause: verb usually at the end

Man means one, people, or you in a general sense.

It does not mean man as in adult male.
It is an indefinite pronoun used for general statements:

• In Deutschland trinkt man viel Kaffee.
  = People drink a lot of coffee in Germany.

So here:

• weil man ihn im Alltag oft hört
• because people / you often hear it in everyday life

Ihn refers back to den Imperativ.

Because Imperativ is a masculine noun, the accusative pronoun is ihn:

• der Imperativ → ihn

So the sentence avoids repeating the noun:

• ..., weil man den Imperativ im Alltag oft hört
• ..., weil man ihn im Alltag oft hört

Both are possible, but using ihn sounds more natural.

Because the subject of the subordinate clause is man, and man takes third person singular verb forms.

So:

• man hört
• not man hören

It behaves grammatically like er/sie/es:

• er hört
• sie hört
• es hört
• man hört

Im Alltag is a common expression meaning in everyday life or in daily life.

Again, im = in dem.
With in plus a location or setting, German often uses the dative:

• im Alltag
• im Kurs

Here it does not mean movement into something; it means being within that context.

In German subordinate clauses, words like oft usually come before the final verb.

So this order is very natural:

• weil man ihn im Alltag oft hört

The basic idea is:

• subject: man
• object: ihn
• adverbial phrase: im Alltag
• adverb of frequency: oft
• verb at the end: hört

German often places adverbs like oft, gern, nicht, etc. somewhere before the final verb in subordinate clauses.

Here it means hear, not listen to.

• hören = to hear
• zuhören = to listen

So:

• man hört ihn oft = people often hear it

The idea is that the imperative is something you come across frequently in everyday speech, for example in commands or instructions.

Yes, that is possible. Both weil and da can mean because.

But there is a slight difference in feel:

• weil is the most common everyday word for because
• da can sound a bit more formal or written, and sometimes presents the reason as more assumed or already known

So the original sentence with weil is very natural for normal spoken or standard written German.