I've been reading some about reverse engineering and decided to try to learn as I go, which has proven somewhat difficult. Sorry about the generic title, I'll try and give enough info so it can be properly answered. I have attempted to view the code of both the exe of the game and the game assembly dll, the game was written in c# with unity, every time I import any of the files into dnSpy it only has a PE tab containing header info I think? BTW the second screenshot is how it is on every item, I've seen some video's where they can edit the c# right in here, is it a security measure or am I an idiot and screwed up? If my question is really retarded feel free to direct me to some beginner resources. I may even just be using the wrong tool. Let me know if you need clarification and thanks in advance for answering my noob question
These sections indicate that this is a standard PE, or binary executable loaded by OS. That means that the code is in assembly, and you need a x64 dissambler(probably) . Try IDA.
Just notice that you have to know quite a bit to reverse a game, and I would start with easy crackme excersices.