• useMemo Hook
• Dependency Array
• contexts

React-query

• Fantastic video on react’s issues (and how react-query addresses them). But in particular, the video was great at summarizing react briefly https://www.youtube.com/watch?v=OrliU0e09io
• understanding mutations and query invalidation:
• most basic ways to set and fetch data using react-query:
  • useQuery for fetch, takes a query key and a function that returns a promise
  • useMutation for setting, takes a function that performs the mutation
• other useful react-query functions: