Calculation of Berger and Buchholz coefficient

Hello! I have a question that I don't really understand this scoring system. How can I calculate their coefficients? Is there a table or formula for it? Could you post it here or send it by e-mail, or can you tell me some literature where I can study it?

Buchholz sums up the points of the opponents played (in case of a tie, the one with the higher sum is better). Berger doesn't know

Since in a tournament system where everyone plays against everyone else, Buchholz is the same for everyone (if the points are equal, of course), Berger enters the game - you get points from a defeated opponent, half points in a draw, and nothing in a loss. So it is more profitable to beat those who collect a lot of points :)

so Berger does not sum up the points of all opponents, but the points of those opponents you have beaten and played to a draw (in the case of a draw, the opponents' points are halved)?

I will also write down here the completely truncated Buhholz logic:

Buhholz's principle is then to add up the opponents' tournament points.
The idea behind a truncated buhholz is to take the sum of the opponents' points and subtract the opponent with the worst score.
In the case of a fully truncated Buhholz, compare the players by taking the truncated Buhholz score and if it is equal for both players, subtract the next worst opponent's score. If the score is still equal, subtract the next worst score. And this is done until a difference in scores is found or the number of opponents runs out.