The timeline in which information is published impacts what you find. For example, the day of an event you can find messages on Twitter, but you won't find a comprehensive study. A year after an event you may be able to find the first longer, more scholarly sources on the topic. This list is ordered from most immediate to least, which coincides with least researchd/contextualized to most. To some extent, this also moves from primary to secondary to teritary resources as well.