I'm currently trying to follow a Bob Ross painting video (yes, I am that bad, but he makes it so much easier) and he lists the colors he uses at the start of the video. I have all of the hex codes for that supposed "exact" color in terms of digital art, but I can't find where to enter it in photoshop. Could anybody give me a hand? Thanks!
Hex is not "exact". People believe that, but it's a misunderstanding. In reality it's just a different notation for RGB values.
If you want exact, hex color is subject to the same requirements for proper color management. A given hex number is undefined until you assign a color space to that number. Only then does it refer to a specific color.
However, a safe assumption with hex is that it refers to sRGB. Hexadecimal notation has its origin before modern color management, and it was used as a convenient way to refer to screen colors.
The only reason I can think of why hex has survived, is that it has a geeky, computerish sound to it. It sounds like it should be accurate. Today it's really outdated.