Link object files together. More information: https://sourceware.org/binutils/docs-2.38/ld.html.
ld path/to/file.o --output path/to/output_executable
ld path/to/file1.o path/to/file2.o --output path/to/output_executable
ld --output path/to/output_executable --dynamic-linker /lib/ld-linux-x86-64.so.2 /lib/crt1.o /lib/crti.o -lc path/to/file.o /lib/crtn.o