Learn Danish: Vinderen vågner allerførst om morgenen. - The winner wakes up very first in the morning.

The word først already means first. Adding the prefix aller- intensifies it to mean the very first or first of all. It emphasizes that absolutely nobody else wakes up before the winner.

Why does the sentence use om morgenen instead of translating in the morning word-for-word?

To talk about a routine that happens during a specific part of the day, Danish uses the preposition om plus the definite form of the noun. So in the morning is always om morgenen.

Why is there no word for up after vågner?

In English, we use the two-part verb wakes up. In Danish, the single verb at vågne means the exact same thing all on its own, so you do not need to add an extra word like op.

How is the word vinderen built from its root verb?

It starts with the verb at vinde (to win). Adding an -r turns it into the noun en vinder (a winner). Finally, adding the extra -en at the end gives us the definite form vinderen (the winner).