Don’t see too many ninja cowboys around here and your question IS rather broad ....but aiming has to do with nice clean sights that are easy to see, not easily disturbed as in knocked out of alignment (adjustable sights are generally better than fixed) and regulated to each other and the bore so that the poa is the same as the poi. What I think you are referring to is marksmanship which is a HUGE subject as it is different for pistols, revolvers, rifles and shotguns. Good marksmanship involves breathing, trigger manipulation, a proper sight picture, a proper hold on the firearm, your stance and a bunch of other things that need to all work together to successfully fire a bullet from a firearm and hit a small, moving or distant target. My standard answer for newbys is to buy a .22 that is as close as possible in operation and feel to the center fire weapon that you want to compete with and shoot it alot. Walmart has .22 lr federal 550 bricks for 19.97 currently. There are tons of books and information in this forum on any kind of marksmanship or shooting sport you are interested in pursuing. Though I don’t know about the ninja marksmanship connection except as it pretains to archery and I sure can’t help you there. Good luck.