How do the Champions League draw lots and decide the opponents in each round?

The order of the Champions League and the AFC Champions League is the same,1-2-3-2-1,in which the third and fourth rounds are so-called back-to-back, and the same opponents switch home and away. The schedule is drawn up in advance, and the next round of competition is not based on the previous ranking.

Competition between teams with equal strength in the third and fourth rounds is very important.

In fact, as far as the home and away double-cycle group matches are concerned, the opportunities are equal, with three home games and three away games. It's just that some teams will use the teams that qualify early in the final round.