x86 and ARM are microprocessor architectures while AVR is a microcontroller. Let's start with CPUs. The biggest difference is that x86 is a CISC (not internally) and ARM is a RISC CPU. The difference is that RISC CPUs using a less complex instruction set, which can be easier to learn, however both are still very complex and can be hard to learn. Microcontrollers are basically encapsulated computers, which unlike the CPUs, contains all the necessary components (like memory for example), but this does not make programming them more or less complicated in general. If you are new to the assembly language, I would suggest to learn with a simple, 8 bit CPU using and emulator to run your code. Or start to understand microcontrollers with a computer game like Shenzen I/O
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