>>2676422The most common PP program would be Adobe Lightroom, you can get that in a bundle with photoshop for around 10EUR a month.
Shooting a jpeg in your camera will give you a pre edited, compressed picture. The camera will do a little post processing, like sharpness and contrast, and spit out the jpeg. Unfortunately it won't do a really good job.
With a raw you'll get a bigger, untouched file with a whole lot to work with. You'll be amazed what data you can find in your pictures and how you can play around with it.
Pic related, it's a screenshot from Lightroom. On the left you can see the unedited version of the picture, on the right the edit with Lightroom only.
There are other programs that do the same, such as Raw Therapee, but I never used them so I can't really tell you much there.
I'm sure you are able to google for tutorials yourself, if you choose to get Lightroom.
