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All of these will require a mask.

1 Shadow highlight.  Duplicate the layer.  Go to Image/adjustment/shadow highlight.  Play with the shadow amount and tone until the shadow you don't like is much reduced or matches the rest of the wall.   Alt or Opt + click on the mask Icon at the bottom of the layer pallet.  You will get a black mask hiding the adjustment.   Paint on the mask with white to reveal the adjustment to just the shadow you want to remove.   If your mask looks too edgy blur it some with Gaussian blur located in the filters menu.  This works even better if you know how to use a smart object filter, because you can keep redoing the adjustment until it looks right.

2. Since you are new to this, just stay away from curves.  It will just drive you nuts.  But invest some time in learning what curves do, because you can fix a lot of things with them.

3. Screen: Duplicate the layer and change the layer mode to screen in the mode slot at the top of the layer pallet.  You will notice that the whole picture will get brighter.  Alt or opt + click on the mask icon again.  That will hide all the brightness.  Using a soft brush with white on the mask paint away the shadows you don't like.  If your mask looks too edgy blur it some with Gaussian blur located in the filters menu.