There is a lot of emphasis placed upon ensuring that the child puts in the right foot in the right shoe. It can often be a bit embarrassing if your child isn't able to decipher which foot goes in which shoe in front of other people. Thus, it is literally necessary that you make them recognize the need for putting the right foot in the right shoe.
Now, despite the emphasis being put on this aspect, there is not a lot being done to ensure that children get to learn this process. One thing we can do to teach children which foot goes into which shoe is by having stickers placed inside. Children are almost always able to recognize their favorite stickers and they would have no hassle in following the drill here for you.