In anticipation of buying a RX10 iv, (after slogging along with my old Canon SX10 for 15 years), I just discovered the wonderful free photo processing program called GIMP. It only took me about an hour to learn all I need to know about using it to do sharpening, size reduction, contrast, white balance, exposure, and a host of other operations I'll never need, and exporting photos taken in RAW format to JPEG or PNG files. I can't imagine anything you'd need to do to a digital photo that isn't possible in GIMP. The menu options, and the options available for the way you can perform many tasks, are extensive. It can be intimidating, at first, to the novice in image processing, but there are extensive tutorials available, and a help menu function within the program itself.
GIMP is free, open source software - so industrious people have written helpful plug-ins that allow the user to do, for example, batch processing (download a program called "BIMP" in order to add this feature to the menus), and to process RAW image files in GIMP. To process RAW images in GIMP, download the "darktable" program. Then, when you open a RAW image in GIMP, darktable will open, showing the image. When you close the darktable window, the image will automatically open in GIMP and be ready for your changes.
GIMP doesn't do everything Photoshop or Lightroom can do, but it is superb for editing digital photos. And it is free, although I gladly donated to the creators, after using it for an hour.