• Understanding low levels, you can understand Ethereum more clearly.
• It is needed to solve Ethernaut
• Prerequisites

It has a risk but also, has merit.

Storage

permanently

on-chain

high-gas-cost

Each contract has 2^256 storage

This article help you more deeply understand

Memory

not-permanently(temporary) during a function execution.

it is used for types of string, array, struct

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Call Stack(Stack)