Quantum computing represents a strategic shift in computational technology, exploiting the principles of quantum mechanics to process data and information. Post-quantum computing entails building cryptographic algorithms that can reduce the potential risks may be involved by quantum computers. As quantum computing progresses, conventional cryptographic techniques such as RSA and ECC become vulnerable. IBM created Qiskit, a tool that Python added, and it offers a strong framework for investigating and creating quantum-resistant algorithms. In this paper, post-quantum cryptography and quantum computing—with a particular emphasis on qubits—are examined. Post-Quantum computing is also discussed with Safe-Quantum Computing. The practical implementations have been being demonstrated in Qiskit-Python by codes and charts. Basic and advanced applications for post-quantum cryptography are discussed for secure communication and future of Quantum Computing. Analysis of results has been obtained from Qiskit simulations.