I like to do this, but every single thing i do ends up very bad with shitty code and not even working, should i quit?

From an Academic background SAP was hardly ever mentioned and I have hardly any idea what it does. I am studying cs and have a practical coming up in the Future and many companies I have looked at state that they are working with SAP. Now what does that mean ? Is it just a set of libraries or APIs in use or how does it influence you from a Developer standpoint?

This question is probably a little vague and slightly off topic but from what i've read on the internet sap seems to be everywhere but theres no good explanation of what it encompasses, which is why i am asking (I have literally no idea) Appreciating any answers!

Edit: i should probably say that im not talking about companies receiving service in form of applications by sap but stating they develop extensions of some form

I created this function for converting a string taken from standard input to an integer:

str2int:
    mov rax, 0

    L2:
        cmp byte [input + r10], 0
        je done2

        add al, [input + r10]
        sub rax, '0'
        imul rax, 10

        inc r10
        jmp L2

    done2:
    ret

but when i use it, it adds an extra 0 at the end of the number (example: a 1 gets turned into a 10, a 30 into a 300 and so), what is the problem with it?

I am curious if anyone of you know of or use a tool you can play around with layout to use as a reference, currently I would just use paper and pencil to write down ideas for screens, modals, and features, then use a drawing pad on my phone to put down boxes that represent where the content will be placed. It is an arduous task, but it really helps me focus as I suck at being very creative when I code since I just sit there changing colors or sizes for hours till it looks ok to me.

I was trying to assemble and link this file, but when i try to link it with the following command:

gcc x64_hello.o -o x64_hello.elf -nostdlib

gcc throws the following error:

/usr/bin/ld: x64_hello.o: relocation R_X86_64_32S against '.data' can not be used when making a PIE object; recompile with -fPIE /usr/bin/ld: Failed to set dynamic section sizes: bad value collect2: error: ld returned exit status 1

I have a project for which i will probably need to lear assembly language for some architecture, but it doesnt have to be an specific architecture, as long as it is a real one is ok, so, what is the architecture with the easiest assembly to learn