Histogram, level, highlights, curves, gradient... ... don't know what it is and don't care ... could know with tons of tutorials you don't have time for ... do know, but want to invest time in more important things right now and get the job done In any case you want to "fix" your picture, give it glow, remove that branch that sticks from that head on portrait, get rid of that pimples on face, change background and replace it or you want your product to finally shine how you intended it to be at first place. Look at my portfolio, tell me what you need and let me do the rest and see how your photos tell a story.