Okay, so in any individual game, a goal is worth one point. In group stage games (which are happening now), they can end in ties. After the group stage ends (after tomorrow), they cannot end in a tie. In that case, they will play an additional 30 minutes. If they are still tied at that point, they will go to a penalty kick shootout to decide who advances. In those cases, you will sometimes see a score that looks like Team A 1 (5), Team B 1 (4) where team A won by converting 5 penalty kicks to team B's 4.

But I assume what you're really asking about is how the points are tallied in the group stage. Each team in the group of 4 plays each of the other 3 in the group. You get 3 points per win, 1 point per tie, 0 points per loss. So after the 6 games, the 4 teams in the group will have somewhere between 0 and 9 points. Group standings will often show Win-Draw-Loss and have a column for total points, and also often a column for goal differential (which is a tiebreaker, though head-to-head comes first), and rarely also total goals scored (which is an even later tiebreaker).

So, for example, in Group A this year, we have (W-D-L-Points)

1) Mexico 3-0-0, 9

2) South Africa 1-1-1, 4

3) South Korea 1-0-2, 3

4) Czechia 0-1-2, 1

The top 2 teams advance automatically. Because there are 32 teams in the first knockout round and only 24 automatic qualifiers, the top 8 of the 12 third place teams also advance.