Low level delivery - basically fly tree top level and drop when the target sinks below your nose.
If you're using this tactic against a fast-moving target you need to predict where it will be after 2-3 seconds and aim accordingly. Fortunately, ground vehicles and ships in the game are too "stupid" to stop or swerve to avoid "running over" the bomb when it explodes.
Make sure that you have at least a 2-3 second delay on your bomb fuses to avoid blowing yourself up.
It's also not so good for heavily defended targets unless you can use the terrain to your advantage, flying "nap of the earth" until you get near your target.
In any case, immediately after your release you should break right or left while keeping your airspeed up, but to help clear the bomb blast area and to make a less predictable target for flak.
Dive bombing. What you do is you pick certain delivery speed, altitude and angle and remember what position the target has to be on the sight. Let's say 45° dive, 1500 ft drop altitude, 250 kts speed, you remember that the target has to be let's say at the very bottom of the reticle. Try it out. If the bombs land long, you change the aim. You train, on and on, and you figure out how to aim eventually.
This technique often gets called "glide bombing" because the angle of attack is shallower and you don't deploy dive flaps in the same way a dedicated dive bomber would.
You always want to have some degree of dive when you release the bomb to minimize its forward motion, making it easier to aim.
Low level bombing and glide bombing are also easier if you align your target path so it follows the target's longest dimension and its travel path (assuming a moving vehicle). For example, if you're bombing a train align yourself so that you're flying over the railroad tracks, coming up on the train from behind. Or, if you're bombing a ship line up so that you overtake it from the rear.
The exceptions are true "skip bombing" where you want to fly level and at right angles to the target's path, so that the bomb hits it broadside.