Is there a cultural reason why some French people view smiling at strangers as suspicious or manipulative?

As a single mom rebuilding and enjoying life, I’m curious: What is one thing you wish more people understood about finding genuine connections in today’s world?
How did you handle unexpected challenges, like the tricky chemistry section, while keeping your confidence up during the exam?
I have an American friend, and I am from Nigeria. My boyfriend wants to bring me to the USA. What should I do?
I just bought potatoes and I don’t know even how to eat them or cook them. What do I do?
What motivates people not to answer the phone in order to help the suspect on the run?