If you are searching Web of Science, there are two ways to find out the impact factor of a journal. The impact factor is a measurement that takes into account how many times the journal's articles are cited, and may reveal something about the journal's reputation.
1. Go directly to InCites Journal Citation Reports, enter the journal title in the search box on the left, and click on search. On the left click on RANK. Q1 means 1st quartile, Q2 means 2nd quartile, etc.
2. Search the Web of Science Core Collection by keyword/topic. Click on the journal name in the search results, or click on View Journal Impact in the article description. You'll see the impact factor, rank and quartile for the journal in the various categories to which the journal is assigned.
Analyzing citation data is one way to measure research impact of individual articles and authors.
InCites Journal Citation Reports: Evaluate journals using citation data drawn from over 7,500 scholarly and technical journals. InCites Journal Citation Reports can show you the:
Web of Science (ISI) Citations and abstracts from scholarly literature in the sciences, social sciences, arts, and humanities. Includes over 8,500 high impact research journals, conference proceedings, symposia, seminars, colloquia, workshops, and conventions also included. Cited reference searching allows you to track prior research, see who is citing your work, measure the influence of someone's work, and navigate forward, backward and through the literature of your discipline. Coverage 1975-present. How to do Cited Reference Searching (video)
H-index stands for Hirsch index. It is a measure of an individual's scientific research output.
It was originally proposed by J.E. Hirsch.
If your h-index is 5, it means that you have 5 articles that have been cited at least 5 times.
However, one should also cite the source from which the h-index was derived, as in: "My h-index is 5, calculated on May 20, 2017, using Web of Science data from 1975-2017."
Hirsch believed the h-index was a better measure than one's "average citation rate." Hirsch used Web of Science as the tool for his calculations.
See: Hirsch, J. E. (2005). An Index to Quantify an Individual's Scientific Research Output. Proceedings Of The National Academy Of Sciences Of The United States Of America, 102(46), 16569-16572.