Duḥkha is a big fancy word that means feeling sad or not happy. Imagine when you fall down and scrape your knee. It hurts, right? That's a kind of duḥkha. But duḥkha is not just about physical pain. It's also about emotional pain. For example, when you lose your favorite toy or when you feel left out from your friends, that's also a kind of duḥkha.
Now, the big idea of duḥkha is that it's a part of life. Even grown-ups feel duḥkha sometimes. It's like when your favorite ice cream falls on the ground or when you have to say goodbye to someone you love. These things make you feel sad, but it's okay to feel sad sometimes.
In fact, some people say that duḥkha is the first of Buddha's Four Noble Truths. This means that Buddha, who was a wise teacher a long time ago, said that duḥkha exists and that we should accept it. But that's not the end of the story! Buddha also said that we can learn from duḥkha and find ways to be happy again.
So, remember: duḥkha is feeling sad, but it's okay to feel sad sometimes. We can learn from duḥkha and find ways to be happy again.