Why am I not getting output when I run the following assembly

I am required to use x86 64 bit intel

section .text
global _start

_start:
mov rax, 1
mov rdi, 1
mov rsi, "hello"
mov rdx, 5
syscall

mov rax, 60
xor rdi, rdi
syscall

I was hoping for hello to print in the terminal. Thanks for any assistance

The instruction mov rsi, "hello" is not valid for what you want to do. If you look at the code generated by such a beast, you see:

00000010  48 BE 68 65 6C 6C 6F 00 00 00  mov rsi, "hello"

The 48BE is an immediate load of rsi and it's using the ASCII values of the characters in hello (padded with zeros) to form the address (68 = 'h', 65 = 'e', 6c = 'l', and 6f = 'o'). This memory address is very unlikely to hold anything useful at all, let alone the characters of the word you want to print.

Instead, you should define some memory to hold the string then load rsi with the address of that, something like the following:

section .text
global _start

_hello:     db "hello", 10
_hello_sz:  equ $ - _hello

_start:     mov rax, 1
            mov rdi, 1
            mov rsi, _hello
            mov rdx, _hello_sz
            syscall

            mov rax, 60
            xor rdi, rdi
            syscall

Compiling and running this results in the following:

pax@hades-1> nasm -f elf64 -o progs.o progs.s
pax@hades-1> ld -o progs progs.o
pax@hades-1> ./progs
hello

You'll notice I've calculated the length of the string using a formula, allowing you to change it without worrying about ensuring the length is updated to match, such as adding a newline character 10 for nicer output

I've also not worried about putting the string into a separate data segment since, as a constant, it can stay in the code segment without issue. However, should you wish to do that, see the example below:

section .rodata

_hello:         db "hello", 10
_hello_sz:      equ $ - _hello

section .text
global _start

_start:         mov rax, 1
                :
                and so on.