What kind of advice or recommendations are you good at giving out?

What kind of things do you personally consider yourself an ‘unofficial expert’ in? Do you give great relationship advice? Parenting advice? Fashion/Art/Decor recommendations? What kind of advice or recommendations do you give with confidence?

I am not asking for your professional background (if you are a lawyer I would hope you could give decent legal advice depending on the topic).. I am asking about what you THINK you know well..

Bonus question: have you become this kind of ‘expert’ based on personal experiences, or based on witnessing other’s experience?... for example, if you think you give great relationship advice is it because you have been in many relationships, or because you have been witness to many relationships via other people in your life and feel you have been helpful to them in the moment?