Are the opponents of each team drawn by lot in each round of the five major leagues? Does the league play two rounds like the Champions League?

The opponents of the five major leagues are arranged before the start of the season, mainly based on the ranking of points in the previous season to ensure that there are several focuses in each round; Moreover, the time of each round is roughly determined, and the specific time of each game depends on the specific conditions of the Champions League and the domestic cup and the weather. In the league, of course, the two teams play home and away, mainly in the first half (first 19 round) and the second half (second half (19 round) (home or away). You think that major leagues are generally 20 teams (Bundesliga 18 teams) and 38 rounds (34 rounds). Of course, the Champions League is similar to the League, and it is also a home and away round. The six rounds of the group match are similar to those of the league match, but the two rounds of the knockout match are separated by one week, that is, one match will be played immediately after the knockout match is played at home (or away).