@nimsbnims For the article by @anon41087856 you cited, concentrate for now on the section “A minimal workflow for beginners”, and use the four modules mentioned there in that order.
For filmic, start with the white and black relative exposure in the “scene” tab, then switch to the “look” tab. Ideally, you should not need to go back to a previous step (ideally…, I rarely manage to do that 
)
I still do most of my basic editing with only three of the modules mentioned: exposure, white balance (*) and filmic.
After that, you’ll probably want to look at some other modules: crop, rotate and perspective, and by then it’s time to start reading up on what else is available: the manual, this site, perhaps video’s by e.g. @s7habo (in this forum) and others).
The above is very much pared down to the minimal essentials, and doesn’t deal with any creative editing or colour grading.
I also left out sharpening, noise reduction and retouch. The first two are either very simple (just use a preset in diffuse and sharpen, or the default profiled denoise) or very complicated (how much to sharpen and where, which of the 4 or 5 denoise modules to use, …), retouch is a bit less easy to use.
*: Lately, the treatment of white balance has changed: recommended practice is to use the white balance module with the ‘camera reference’ setting, and do the actual white balancing in the color calibration module. But that’s another rather imposing module on first acquaintance… The “old” way still works…