Navigate this libguide from the TOC below or the blue tabs (and sub-tabs) above.
On April 1st, 2012 Google announced a new Google Scholar service: Google Scholar Metrics. "Scholar Metrics summarize recent citations to many publications, to help authors as they consider where to publish their new research." According to Google, "Scholar Metrics are currently based on our index as it was in July 2018."
"To get started, you can browse the top 100 publications in several [broad areas of knowledge, disciplines, and] languages, ordered by their five-year h-index and h-median metrics. You can also search for publications by their titles, and then compare the publications that are of interest to you. Finally, if you wish to see which articles in a publication were cited the most and who cited them, click on its h-index number to view the articles as well as the citations underlying the metrics."
See, for example, Google's estimate of the top 20 journals in the following disciplines: