I saw your other recent post in the Nikon forum and see (like me) you shoot with a D7200.
I would strongly recommend you have a look at Nikon's own free image processing software, Capture NX-D, designed to deal with Nikon NEF files. The big advantage if you are new to RAW processing is the fact that the default settings are essentially what you see if you shoot JPEG, so you start off with a decent image and can then optimise it to taste. I'm fairly new to this myself, but the trick is not to overdo it if you want a natural-looking image - having said that, its possible to increase shadow / highlight detail (with Nikon's 'Active D-lighting'), reduce noise, improve sharpening, and alter detail levels, ending up with a significantly improved image compared to what you would've got with the JPEG. I've never found any advantage in altering the colour balance, as I believe it's already optimised in camera, but sometimes increase saturation and hue.
It doesn't take a great deal of time per photo, although I find I'm quite selective about the images I keep, and it has thumbnail viewing options to help with sorting.
The other method I've used is the Snapseed app on the iPhone, when I was away recently and didn't have access to my PC. Its a relatively simple RAW processer, easy enough to use, with some functions like 'curves' maybe implemented better than NX-D (although missing the equivalent 'Active D-lighting').
I've thought about maybe graduating to a Lightroom subscription (which is also available as an iOS app), but I've actually seen reviews which compare NX-D favourably to Lightroom, particularly in terms of its treatment of colours, so I'm saving my money for now.