What type of processing techniques are you talking about? Like stuff beyond what you can do on Lightroom? I want to get really good at postprocessing and will take all the advice I can get.
I doubt Lightroom itself is enough - for this we need a tool that can do some advanced work with layers and masking. I never really used Lightroom primarily and don't use it at all any longer (I used
DxO PhotoLab and now almost exclusively use
Capture One), but as Lightroom improves, I can imagine that new useful features come up and might even allow for this kind of postprocessing.
For example, I mean stuff like
exposure blending - let me give an example: Let me have a high dynamic range scene, and decide to take 3 images of it: First, I take a slightly underexposed shot (underexposed so that the significant highlights do not get overexposed). Second, I take a normally exposed shot. Third, I take an overexposed shot (by 2 stops or so). Note that you can take more and more heavily overexposed shots; based on your needs. Once I have these shots, I develop them into 16-bit TIFF files in such way that I normalize the exposure levels down to the level of the underexposed shot to make it easier to work with later in the postprocessing (NOTE: the overexposed images will most likely have a lot of areas blown out in it once brought down by 3+ stops). After developing the images, I import all three into my image processing program (currently
Affinity Photo, previously Photoshop), as layers of a single image. Then I align those images; and start to stack them using luminosity masks - so that I keep highlights from the underexposed shot, brought-down shadows from the overexposed shot, and the rest from the normal shot. Sometimes the luminosity masks won't work on their own (e.g., when having moving objects like grass, trees, etc.), so that I will have to do manual tweaks there; or use something like Photoshop's edge detection (maxing it out on each blended layer, basically), which tends to help. Lastly, I adjust the blended image's parameters like exposure, contrast, color curve, etc. to the levels I want for my final image. I find this technique very capable, and one that tends to yield very natural results of the resulting image (unlike traditional HDR...). On the downside, it can add quite a bit of work, depending on the volatility and complexity of the scene (too many small moving portions with high contrast tends to be quite a challenge).
If you have a very static scene (in which things don't move) and don't want to have to deal with luminosity masks (or even more laboriously doing the masking manually), you can do
mean stacking by taking e.g. four exposures with the same settings, which you either directly in the camera, or in postprocessing, can merge using pixel-level averaging. The effect of this will be drastically reduced noise levels in the final, stacked, image. Note however, that (1) this can cost some sharpness; and (2) shadowy areas will have less detail compared to the method described above (exposure blending); because our digital sensors are simply incapable of capturing as much texture detail in shadows as they can close to the values of sensor saturation (highlights that are not overexposed). Hence, I would say that exposure blending tends to be a superior method compared to mean stacking - exposure blending gives more detail across the tonal range, even in the shadows; and is more applicable for more volatile scenes. One scenario in which mean stacking wins over exposure blending is when you e.g. have a busy road, a brige or so; and want to take enough exposures so that you can then in postprocessing mask out parts of them so as to remove moving objects like people, cars, bikes, boats, waves, etc.
Lastly, there is traditional
HDR, but that one I generally would do not advise - it is way too easy to do and often produces way too cheap and unrealistically looking images compared to exposure blending. One type of scenario in which HDR might be OK tends to be architectural photography; but I believe that you can always achieve greater results with more control by exposure blending. There actually are HDR features in most image processors - Lightroom, Photoshop, Affinity Photo, as well as dedicated HDR tools like Photomatix Pro, Aurora HDR... but again; HDR is a last resort solution to me.