When choosing which types of resources to search for, it is important to bear in the mind the "information timeline" - how some types of information are published more quickly than others. For example, news reports and commentary about an event or incident will appear almost instantaneously on social media and news websites, whereas journal articles containing a case study of this occurrence will not be created and published until much later - a year, or even more.
You will need to consider this timeline when deciding what to look for within your topic. Let's say you're looking at the impact of natural disasters on tourism in different locations; if you're looking at specific examples of where a natural disaster has occurred in a popular tourist destination, you are far more likely to find book chapters and journal articles on something that happened a few years ago, than you are for something which only happened last year.
Once again, it is important to decide what type of information you need to find for your assignment; for example, whilst social media threads can provide a useful insight into reactions to an incident as it happened, if your assignment brief requires you to find scholarly analysis of an event, then this type of resource would not be appropriate.