My first tip is really more a superstition than a tip. If you spill salt, you have to flick some over your left shoulder and you might as well flick some over your right too for good measure because my Nana said so and she lived until her 80s.
I wonder why this is such a prevalent superstition. Salt as a means of purification is a big thing in Japanese culture and Shintoism as well. That’s why the sumo wrestlers throw salt over their shoulders before they run at each other. A lot of restaurants have little bowls of salt at their front door too and sprinkle on the sidewalk to ward off bad luck.
I know a few grannies who throw salt outside the front door when they’ve had a visitor that they did like/didn’t want to come back
Without looking it up I'm gonna assume it has to do with salt once being a precious commodity so using it to ward of evil spirits would be like giving it all you've got. 🤷♀️