So I built a very basic map of just a road with a speed bump in the center because I'm new to mapping and wanted to test out what I can make, and I've run into this issue where when I go in game (run the compile), a lot of my textures end up being dark or black. In radiant it looks fine and some of the other textures work too but some refuse to show up properly. Can anyone help please?

https://imgur.com/a/7HEHsxQ

(also if anyone knows what the yellow text at the top means I would appreciate it)