Learn Dutch: Hij heeft het druk, want alles is urgent. - He is busy, because everything is urgent.

In Dutch, you do not say that someone is busy using the verb zijn (to be). Instead, you use the fixed expression het druk hebben (literally: to have it busy). So, hij heeft het druk is the only natural way to say "he is busy".

The lesson is about obligations with hebben te. Why is there no te in this sentence?

This sentence uses the verb hebben, but it does not express an obligation to do a specific action. You only use hebben te (to have to) when it is followed by an infinitive verb, like hij heeft te werken (he has to work). Here, heeft is simply part of the idiom for being busy.

What is the word het doing in heeft het druk?

In the phrase het druk hebben, het (it) acts as a mandatory placeholder object. You are not saying he has a specific busy item; he just experiences "it" as busy in general. You cannot drop het from this expression.

Why is the verb is in the normal position after want?