Never bring colleagues home. If they know you're poor, they'll look down on you in their hearts. If they know you're rich, they'll find ways to trip you up whenever they get the chance. Also, don't keep a tea table for entertaining guests or a dining table for gatherings at home. Discuss matters outside, eat outside, and even keep your home’s location and floor level a secret. Once you bring someone into your home, your living environment, financial situation, and some little hidden quirks will be seen clearly. This is not socializing; it's setting a trap for yourself.