It depends on the format of the chart, and I don't know if you're looking at a chess.com tournament, or the results of a recent FIDE tournament on some website, or if you're asking for when you go to play OTB (over the board) yourself.
But it's pretty self explanatory. A win is 1 point, a draw is 0.5 and a loss is 0. W means white, B means black.
Umm, other than that... I guess players are ranked. So The #1 player is the person leading the tournament (or who has already won).
So if you see in someone's results something like 15 W 0
It means they played white against #15 and lost.
46 B 0.5
Would mean they played #46 with black and drew.
Sometimes they use cumulative points
So 33 W 5
Would mean they played #33 with white, and after the game, their total score in the tournament was 5. If you look a their previous round and they were at 5 there too, then you know they lost against #33
Admittedly an idiot question. I haven't played in a tourney in 30 years...
How do I read the tourney pairings/result chart?
Sean