When you use another author's words or ideas then you should acknowledge the source of the information, this is known as referencing.
There are many referencing styles and you should always check with your unit assessor for the correct style preferred for each particular unit.
SCU Library has developed guides for the APA 7th and Harvard styles:
Take a look at these quick guides created by the Learning Zone:
For more comprehensive guidance on literature reviews take a look at the library guide from JCU: