Personaly speaking NONE!
Every culture has more or less superstitious elements and beliefs in it.
So, here are the ones I have heard so far:
• It is believed not to wear clothes of black colour to the events of joy and celebration like weddings and religious events.
This is because people think that black is the colour with negative vibes that can spoil the vibe of the joyous event.
• Women are not allowed to visit temples(a building devoted to the worship of a god or gods) or any other place of religious importance when they are on their periods.
Women are believed to be unpure during the periods and are restricted from entering the kitchen too.
• While someone is stepping out of the house they should not be offered food.
It is believed that by doing so the work they are supposed to do will not go well.
• Elder tells the rest to not say words like “Come” and “let’s go” at crossroads and at some unexplored or virgin places as that might attract the wandering souls to come with you.
• Women are expected to fast for the long and healthy life of their husbands and if they break that fast then their husband would die.
And there are many such beliefs that have no logical or scientific explanation and yet they have prevailed for centuries.