The Effectiveness and Efficiency of Using E-Learning in a Digital Learning EnvironmentNorfaridatul Akmaliah Othman, Doni Purnama Alamsyah, Johan Muliadi Kerta, Doni Morika and Yudi RamdhaniE3S Web Conf., 576 (2024) 01004DOI: https://doi.org/10.1051/e3sconf/202457601004