All journals that index in Scopus are peer-reviewed and reliable . I agree with Singh, SCIMAGO and THOMSON are the best reference for checking the quality of journals
Journals included in "Journal Citation Reports" ( Owned by Clarivate Analytics) and "Scopus" ( owned by Elsevier) are peer reviewed. Peer reviewing is a basic requirement for inclusion in the above databases.
This is an excellent question. Unfortunately, there are an increasing number of what called “ Predatory journal / publishers”. Therefore, we have to be keen and aware. The Beall's List of Predatory Journals and Publishers is useful.