Consensus mechanism is a specialized skill that refers to the process of achieving agreement between parties in a decentralized network. It is critical in ensuring the validity and security of transactions in blockchain networks. Some of the most popular consensus mechanisms include proof of work (PoW), proof of stake (PoS), and delegated proof of stake (DPoS). To be proficient in consensus mechanism, one needs to have an understanding of various blockchain technologies, algorithm design, network security, and cryptography.