Understanding histogram

Understanding histogram - student project

Thank you for the class, Helen, but I have a question:

When I see on a histogram of an image that it hits the left side ( that black pixels are lost) - does it make any sense to try to correct it? I tried to change blue and green colors via color channels, but I think that it only made things worse.

This is a screenshot of the original image:

Understanding histogram - image 1 - student project

And this is after :

Understanding histogram - image 2 - student project

Thank you for your class.