This resource provides an introduction to the fundamentals of quantum computing, starting with the analogy with classical bits and moving on to the concept of qubits and their states described by complex numbers. It explains the basic quantum gates such as the bit-flip (X), phase-flip (Z), and Hadamard (H) gates, as well as two-qubit gates such as CNOT and CZ, demonstrating their operation in quantum circuits. It concludes with a discussion of the measurement process in quantum computers and its impact on the state of qubits, emphasizing the need to review the material for a better understanding before exploring quantum error correction.