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The investigation of emission line regions within active galaxies (AGNs) hasa rich and extensive history, now extending to the use of AGNs and quasars as"standardizable" cosmological indicators, shedding light on the evolution ofour universe. As we enter the era of advanced observatories, such as thesuccessful launch of JWST and the forthcoming Vera C. Rubin Observatory'sLegacy Survey of Space and Time (LSST), the landscape of AGN exploration acrosscosmic epochs is poised for exciting advancements. In this work, we delve intorecent developments in AGN variability research, anticipating the substantialinflux of data facilitated by LSST. The article highlights recent strides madeby the AGN Polish Consortium in their contributions to LSST. The pieceemphasizes the role of quasars in cosmology, dissecting the intricacies oftheir calibration as standard candles. The primary focus centers on therelationship between the broad-line region size and luminosity, showcasingrecent breakthroughs that enhance our comprehension of this correlation. Thesebreakthroughs encompass a range of perspectives, including spectroscopicanalyses, photoionization modeling, and collaborative investigations with othercosmological tools. The study further touches on select studies, underlininghow the synergy of theoretical insights and advancements in observationalcapabilities has yielded deeper insights into these captivating cosmicentities.

Spectral variability studies in Active Galactic Nuclei: Exploring continuum and emission line regions in the age of LSST and JWST