Having laid edges are the thing to do right now,but this is nothing new.
Some use a toothbrush and gel.Some use a brush and some type of edge control,or pomade.It really just depends on your hair type. For course textures,I suggest styling damp hair with a good hair gel. Firmly tie it down with a scarf,and sleep in it overnight or for a few hours.
At the salon, edges can be laid down by a wrapp-it white styling strip. Then the client is placed under the dryer.