What are some lessons you learnt from hardships you faced?

Asking this because I realized some of them too after a major depressive episode spanning over a couple of years.(still kind of does)
I did not take things seriously and probably even for granted.
Want to look out for the future ahead without having to experience the hardships myself owing to fact of my being completely drained emotionally and physically.

These lessons could cover any subject,though.I welcome all kinds of advice.

I hope you people are doing okay,

edit-title:what are some lessons you learnt from the hardships you faced?