Hey there. I was wondering if anyone had this problem. I have a Dell computer with windows 10 software, and where I save my work it comes out lighter thay what I actually painted. Can anyone help solve this problem?

Sounds like either your monitor gamma needs to be calibrated( lots of info on the web about that-- try to find some specific to your hardware) OR
you are using a non RGB color profile when setting up your document. (if the only place your art will be displayed is on a monitor.web, or phone -one of the srgb icc is the best choice. one of the 2 available sRGB {linear} options might fix your problem-- and stick with 8 bit integer bpp unless a specific type of project calls for something else)

Its also possible that your document and working color profiles are mismatched. check in Settings\configure Krita\Color under the soft proofing and Display tabs to make sure they match your document's color profile.