I'm having trouble creating a map. half of the map is almost covered with a shadow that is completely black. please help (only ground is in the shadow the rest of the normal) [sorry for my bad english] here is an image: https://imgur.com/gallery/BHE9IsE
Speaking from own experience, you either have a leak or an improperly configured skybox. Check the log file Hammer generates for the word "leak", using Ctrl+F, if it highlights a result, you need to find where your map isn't sealed completely. Hammer exports the log file to the location where the map is compiled, under the same name. So if I compiled a map under the name of awesomebox_skial_alpha.bsp, the log file's name would be awesomebox_skial_alpha.log Valve Hammer - Leak It would also be a good idea to search for "error" and "warning", there could be another problem that Hammer could have reported.
