Don't just read. Experiment. This is a fun science project. Smell your herbs and oils. Pick a scent you like. You like vanilla? Gnats hate it too. Vanilla extract works!
Go ahead. Spray some vanilla. Or light a citronella candle. The best part? You win without even trying. You smell amazing. They smell disaster. It's the ultimate power move. And now you know the secret. Go forth. Be stinky. Repel the tiny beasts.