Broadcast sowing mostly relates to outdoor lawns. It also is the way to start practically all covered sowing.
Outdoor plants can occasionally be sown in growing beds in this manner, as can certain annuals, but it is rather rare.
Outdoors, on small surfaces, gardeners prefer using row-sowing or seed hole-sowing, especially for vegetables.
Pour the seeds into a bowl for easy grasping.
Grasp a handful of seeds. Spread the seeds along the ground in a regular, even manner, casting the seeds out with a wide sweep of your arm.
Verify that the entire surface is covered.
It helps to first stroll along one direction back and forth, and then to have a second pass at a right angle to the first one. Seeds spread out more evenly that way.
When you’re sowing in trays, to start seeds in spring for instance, you can use broadcast sowing to spread the seeds across the tray.
Outdoors, damping off isn’t often a problem, but in trays its very common. Best prevent it with a little charcoal.
If it seems difficult to get the right gesture, some stores sell seeders that can spread the seeds for you!