Once again I lay my ignorance of the game of football on the line. Officianados could bore you to tears with technical debate abut the nuances of what is called "the beautiful game" and I have no truck with that. I respect its place in our culture and dare not ignore the sheer magnitude of the game.
However, as an aloof observer I can't help feeling that scoring is a lottery. A team visits its opposition goal area and takes a pot shot or two, with a generally low ratio of success, then they all go and camp on the other side of the field to allow the opposition their chance to have a go. That is over-simplifying the issues a bit, but it certainly looks that way. Scoring is a lottery, a pitching of odds that tilt in the favor of the attacking team under very trying circumstances.
The trick is to minimise the odds of the opposition scoring, through solid defence and effective goal keeping. At the same time, knowing that attack is the best form of defence, a team must tilt the odds of scoring in its own favor, by retaining possession of the ball, spending more time in the goal area, whilst positioning players as favorably as possible and ensuring as many shots on goal as possible. Other aspects that tilt the odds are fitness, agility, knowledge of the rules, avoidance of penalties and referee management.