Here’s the honest truth: Gatwick North and South are like two siblings who don’t get along. You can easily end up at the wrong one if you zone out. Look for the big “N” on the signs.
I once saw a man get off at South Terminal with a terrified look. He ran back to the train, but the doors closed. His face said, “This is how my holiday ends.” Don’t be that man. Read the signs.
And if you do mess up? Don’t panic. There’s a free shuttle train between terminals. It’s annoying, but it’s not the end of the world. Now go, brave traveller, and conquer that terminal with your overpriced luggage and your dignity intact.