If you unzip a folder, you get 2 options.
One is "extract here", which places the contents of the zip file into the folder the zip file was in. For example, I downloaded SCY_1.65rc1 and clicked "extract here", which made a folder called "SCY". That is the folder I need to put in the mod folder for it to work.
The other is "extract to [name of the zip file]". This makes a folder with the same name as the zip file, and puts the zip's contents in it. For example, I downloaded SCY_1.65rc1.zip. I clicked ''extract to SCY_1.65rc1'', which made a folder called "SCY_1.65rc1", which contained the "SCY" folder. I need to put that folder in the mod folder, not "SCY_1.65rc1".
Basically, just open the folder you have inside your starsector "mods" folder. Does it have a bunch of folders and files in it, like "data", "graphics" or "mod_info.json"? If so, then that's the folder you want. Does it have one other folder in it that has the mod's name? That's the wrong one, get the folder inside it instead.