What you tell about yourself can determine the tone of the future society, so it is important to be sincere and open.
About yourself, but without self-promotion:

Telling about your manifestations, hobbies or work is a good idea. This helps the interlocutor better understand who you are. But you should not turn the story into self-praise. Speak honestly and enthusiastically to interest your partner.
Your values ​​and views on life:
You do not need to get dirty in philosophy, but you can unobtrusively mention what is important to you. This will give the interlocutor the opportunity to understand you as a person, to understand your values.
A little personal, but without going overboard:
You should not tell something very personal on the first meeting. Also, do not turn the conversation into a monologue. Also show enough interest in your partner
Your goals or dreams:
Don't immediately share long-term plans like "In five years I want to move to another country," but you can talk about your interesting aspirations. This makes you more interesting
What should you avoid?
Complex or controversial topics
Negative feedback about yourself.
Excessive details.
The main rule: Be yourself, and don't try to be someone you are not.