Remember in your high school English class you would read a ten line poem about a horse and then spend two weeks analyzing it, culminating in an 5 page essay where you argue the horse represents Columbus, it's hay represents atrocities against Native Americans, and his owner the King and Queen of Spain? This is that experience put to film.

Danny wearing an Apollo sweater? That symbolizes how Kubrick faked the Moon landing. Source you ask? Super reliable guy who says he has friends that say he's right and the government is tracking him.

Redrum and Danny hiding his tracks by walking backwards? That means Kubrick wants you to watch the movie in reverse at the same time as watching it forwards so you'll notice that sometimes peoples faces slightly overlap and Jack's name in the starting credits lines up with his picture at the end of the movie. We'll just ignore how the picture takes up the entire screen and the credits scroll up so at some point they will be in the middle of the screen.

However when you go back and read that poem about the horse? Turns out it's just about a horse because horses are cool. Apollo sweater? Space is cool. I'm sure if Kubrick put Danny in a T-Rex sweater he would have claimed Kubrick knew dinosaurs aren't real. Redrum? Sounds cool, spells murder backwards, and is easy for a six year old to say. Danny hiding his tracks by walking backwards? A smart move by Danny.

In the end sometimes a horse poem is just about a horse. Do yourself a favor, avoid this and rewatch The Shining, read it's Wikipedia page, and a 10 minute YouTube video about cool things throughout the movie.