babies/kidswho sleep easily after being put in cot, how did u achive that pls.

i know babies children vary
and i know some put their babies children to sleep with rocking, in arms pusher rocker,with or without alot of crying , with or without a dummy,

but i wonder those who hav e achived babies or children who sleep easily after being put in a cot with or without a bit of patting, how di dyou acheive that pls?