There's always something more to read that can potentially give you more insight. There is seldom a point that will tell you you're done.
Because research is open-ended, it can be hard to keep up It is helpful to decide upfront how much time you want to commit to research. Also, ensure making the end goal something about the information, such as writing an essay or report.
Once you know the topic, find the expert vocabulary for your topic. Experts use precise words. They have chosen words carefully to point out minor distinctions in ideas.
Wikipedia is a good starting point to find the ordinary language that points to expert concepts. Type your idea in Wikipedia as you see it, then note the words used by experts. Then use these keywords to identify key works.
Once you've found the keywords and some main papers or authors everybody cites on the topic, try to find reviews.
It can be helpful to type a keyword with the words "review" or "meta-analysis" in Google Scholar. For textbooks, type a keyword in Amazon and limit the search for textbooks.
Once you gained some understanding in a field, follow citation trails. There will often be dozens of other papers cited and can result in an extensive reading list. Thus it is helpful to limit yourself to the few most promising ones.
Citations need two factors: frequency and relevance. Works cited more often are more central to a topic. To ensure that you don't spend too much time going down rabbit holes, aim for breadth-first.
A classic problem in research is to forget what you've read or where you've read it. Some people use Zettlekasten, a sophisticated note-taking system.
Another system is Caplan's approach, where you highlight the sections you may need to revisit later. Then make a new document that will contain your notes and quotes as well as your summary of the work. The goal is to have a map of the area, so you know where to find it again.
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