Just bare in mind man, that if you shoot to jpeg then a lot of image data is deleted straight away - like detail in shadows or highlights.
Shooting RAW and converting to a file like .tiff is the only way to retain all image detail.
This.
You should always use a cataloging program like Lightroom (i find this the best, there are others)
Import your raws, work on them and export in whichever format you want all the changes can be removed from the image to leave you with the original and it's none destructive editing.
You can go back, edit, save, back to original as many times as you want.
If you have a lot of photos you can batch edit right on import, 5 mins, done.
I really don't know how somebody could own an extensive photo collection without a program like this tbh.