I have four video editing programs and Serif MoviePlus 5 had the most accessible project setting at 4 a.m. so I'm going with that as the illustration.
Those of us in Canada, U.S. Mexico, Japan and Korea will want to use the NTSC section.The first level is standard definition. If your camcorder, smartphone or tablet records in standard def then this is where you select the correct project setting that matches what your recording.
The video dimensions of your recording. This is why you need to know the specs of your recording device. Some of the common but not exclusive standard definition dimensions are:
If you are recording with a smartphone/table don't assume that you are recording in high definition. Check the specs of your device to make sure.
320 x 240
640 x 480
720 x 480
The next level down is NTSC high definition:
The project settings lets you pick the best editing template that matches your video. In user friendly video editing programs you might not need to worry about it; many programs will select the right format when you add a video to edit. Others might ask "do you want to change the project settings based on this video?"
No worries. If the settings don't work match what you need you can always go back and make changes. If you video format is different most editing software programs will let you customize the settings.