A standard golf course has ten par 4 holes. They’re hard. Even the pros average a touch over par on them in aggregate. The key is the second shot, but the first and third shot are right behind in importance.
The tee shot needs to be in the fairway. Colin Montgomery said, “The reason people think I’m such a good iron player is that I’m always playing my second shot from here (pointing to the fairway) instead of from over there (pointing to the rough).”
If the rough is low, if fairways bunkers have shallow lips, if there are no trees to hit into, you still have a chance if your ball ends up in one of those places.
Best, though, to play for the fairway. That might mean leaving your driver in the bag occasionally. Something to consider.
The key, now, is the second shot. The big mistake is hitting short of the green. You either overestimate your how far you can hit a club, or you have the right club but don’t make good contact.
Start out choosing your club based on the distance to the pin. Then take one more club (say, a 6-iron instead of a 7-iron), and grip down about an inch. Put a normal swing on the ball.
A good shot will get you past the pin (always good), and if you don’t quite get all of the shot, you’ll be short of the pin, but still on the green.
In addition, most of the trouble around the green is in front, and you’ll be hitting over it.
When selecting your club, do not forget to consider other factors such as differences in elevation between you and the green, wind, dampness in the air, your lie, and how you’re hitting the ball today.
If you got green-high in two, odds are your third shot won’t be that close to the hole, so you’ll have a longish chip or approach putt left.
This is where chipping practice and long approach putt practice (30-40 feet) comes in. You have to get the ball to three feet or less with your third.
Having gone through all that, the advice that puts it all together is to plan the hole backwards, from green to tee.
If you know the course well, you should know where in the fairway you want to hit into the green from. Now you know where in the fairway you want to put your tee shot.
Finally, some par 4s are just to hard for you. Play those as a short par 5 to keep the double off your card.