When learning data science, you'll often want to locate existing datasets to use for projects. Here are some good resources to help you find data on a variety of topics. This is a list of places to locate datasets on a variety of topics. Unless otherwise noted, the data is public (i.e. it's free to use for your projects).
Resources by topic
Shark Attack Data - A robust source for data on human/shark encounters from 1900 to present.