What is the role of the first half of the Champions League group stage?

Distinguish between TV broadcast and game time up and down! The same association will not hold all competitions on the same day. For example, in the Premier League, there are four pairs in the top and two pairs in the bottom, ensuring that the game will not be arranged on the same day. For example, if Inter Milan and AC are both home, they should be separated.

In addition, the draw for the first 16 is not what you said. The rule is:

Teams from the same football association will not be drawn together.

Teams in the same group will not be drawn together.

The first place in each group will not be drawn together.

The second place in each group will not be drawn together.

The second place in the group stage is played at home in the first round and away in the second round.