There are two basic ways to find information once you start researching your topic:
Citation searching or chaining involves searching backwards and forwards in time for materials that are cited by and also that cite an article or resource you already have. One resource links you to another, which links you to another, and so on to create a chain of relevant literature.
This is a useful research tactic when you are working on a literature review since it helps you follow chains of related sources.
For example, let's say you've found a relevant article on your topic. You can make a chain of citations leading from that one article both forwards and backwards from the year of publication:
Resources cited in your article
Resources that cite your article
Tip: articles published in the last few years might be too recent to have any other articles citing them.