The key to happiness is a complex and subjective topic, as what brings happiness to one person may not necessarily bring the same level of happiness to another. However, based on extensive research and studies on the topic, there are a few key factors that are commonly associated with happiness:

1. Positive relationships: Having supportive and meaningful relationships with friends, family, and romantic partners can provide a sense of belonging and purpose, which can contribute to overall happiness.

2. Gratitude and positive mindset: Cultivating a positive mindset and practicing gratitude for the good things in life can increase feelings of happiness and contentment.

3. Pursuing meaningful goals: Setting and working towards goals that align with one's values and interests can provide a sense of purpose and accomplishment, leading to increased happiness.

4. Engaging in enjoyable activities: Participating in hobbies and activities that bring joy and satisfaction can contribute to overall happiness and well-being.

5. Taking care of physical and mental health: Prioritizing self-care through healthy habits such as exercise, a balanced diet, and adequate sleep, as well as seeking support for mental health concerns, can improve overall well-being and contribute to happiness.

It's important to note that the key to happiness may vary from person to person, and what brings happiness to one individual may not necessarily work for another. Therefore, it's important to explore and discover what works best for oneself in terms of promoting happiness and well-being.