What are Issues?

I just got this program and love how well it cleans out the unwanted cookies and other internet stuff that ties up my space, but I am not sure what the Issues tab shows me and would like to be informed before I "fix them". If anyone can tell me what "issues" are please reply to this and explain it to me. (in the simplist terms possible please ty) :D

Hello rep114 and welcome to the forum,

Have you had a chance to read the beginners guide yet?

http://www.internetrotsyourbrain.com/ccleanerbeginnersguide/

This may help explain things a bit, and then ask more questions if you need to :)