I shot a ton of pics today, and trying out Auto vs Aperture settings on my D5200, I did not realize that the ISO was set to the outrageous number it was. I got home to find that about 1/2 the shots I got today were just washed out. Is there a way to fix the shots that were taken today, or are they just a loss and learning experience? I shot in RAW and have access to Adobe Lightroom and Photoshop. I would greatly appreciate any input!
Adjusting the exposure is a basic feature of the "developing" software. If you are shooting RAW images, you have more latitude in the image data than the normal presentation of such an image can handle, so you have some artistic interpretation to make there even when the photo captures the entire range of light available without error. There is a slider for this, and a histogram and analysis tools to use whike doing so.
Since you had to ask, I think your real question is "what is workflow?" Or "I'm ready to take my camera off full-auto. What do I need to know?"