https://oxfordre.com/

If you are researching an unfamiliar topic and seek peer-reviewed material, the Oxford Research Encyclopedias may be a good resource.  From the site:

“The OREs offer long-form overview articles written and edited by leading scholars and researchers, addressing both foundational and cutting-edge topics across the major disciplines. Oxford University Press is developing this program in response to a growing need for reliable information to be used at the start of serious research on an unfamiliar topic.

Designed to inform academic research at all levels, the Oxford Research Encyclopedias will be a constantly growing and evolving reference source. Each subject goes beyond the basic facts to contextualize topics within existing scholarship and help pave the way to deeper engagement and inquiry.”

Several different subject areas are covered, from African History to Religion, and from the link above you search the topic on the right hand side of the site.  Once you choose a link you are directed to an entire site dedicated in great detail to the topic.  One drawback to the site is that some of the information may only be accessed via subscription, though there is some free content as well.