Gcc cannot be compiled in linux

In linux, gcc cannot be compiled-general Linux technology-Linux technology and application information. The following is a detailed description. Ladies and gentlemen, I used linux for a few days (Ubuntu9.0). The problem was that I wrote a hello. c file on the desktop, and then
The command for compiling is as follows:
Win @ ubuntu :~ $ Gcc-o hello. c
Gcc: hello. c: No such file or directory
Gcc: no input files

Win @ ubuntu :~ $ Which gcc
/Usr/bin/gcc

Win @ ubuntu :~ $ Gcc version
Gcc: version: No such file or directory
Gcc: no input files

Why? I don't understand it. I read a lot of books and didn't explain it above. Now I am eager to program C in linux. So I hope you can help me. Thank you!