The lightning-fast growth of Distributed Energy Resources (DERs), such as solar photovoltaics, wind power, battery storage, and electric vehicles, has revolutionized the dynamics of the new power grids. Although the technologies hold great promise for clean energy production, they bring along intricacies in grid reliability, stability, and real-time management. Advanced Grid Management (AGM) technologies have been developed as a vital solution to overcome these issues by providing flexibility in integrating DERs, power flow optimization, and maintaining uninterrupted supply. This article discusses the potential of AGM to improve the reliability and stability of power grids by utilizing sophisticated control functions, prediction analytics, and smart automation. It investigates the technical, operational, and regulatory structures enabling smooth DER integration, with an emphasis on artificial intelligence use, Internet of Things (IoT) technologies, demand response management, and blockchain-based electricity transactions. The research emphasizes the need for control of voltage and frequency, real-time monitoring, and cyber secure communication networks to ensure grid balance under variable energy demand and supply. Case studies of smart grid implementations are shown to ensure the effectiveness of advanced management tools in obtaining high-performance results. In addition, the paper points out major barriers such as interoperability issues, infrastructure cost, and policy constraints while proposing future directions for sustainable grid modernization. By utilizing advanced grid management strategies, stakeholders and utilities can realize a more decarbonized, efficient, and resilient energy system, thus enabling the world's shift toward net-zero emissions and renewable energy.