You should look through my Assembly LearningRepo first before learning Shellcoding.

We need to remove all bad chars from our shellcode in order for it to work

• 00: This is the zero value or null terminator(\0)
• 0A: This is the line feed(\n)
• FF: This is the form feed(\f)
• 0D: This is the carriage return(\r)

we shall use "lea , [rel ]" where the rel instruction will compute the address of the source relative to the RIP register.