Indexation of a journal is considered a reflection of its quality. Indexed journals are considered to be of higher scientific quality as compared to non-indexed journals. Here’s a list of common indexing sites you could explore:
Scopus: Managed by the publishing company Elsevier, Scopus indexes journals from the fields of science, technology, medicine, social sciences, and arts and humanities.
PubMed: Maintained by the United States National Library of Medicine, PubMed covers biomedical literature from life science journals, and online books.
SCIE: SCIE is a product by Thomson Reuters. It covers journals from a range of scientific and technical fields.
DOAJ: DOAJ is an online directory that indexes and provides access to open access, peer-reviewed journals covering history, religion, geography, language and literature, etc.
UGC CARE: The UGC has set up a Consortium for Academic and Research Ethics (CARE), as announced vide. the UGC's notification of 14 January 2019 to continuously monitor and identify quality journals. across disciplines.