A citation style (or format) specifies what information should appear in your citation, how that information is ordered and how it is formatted (punctuation, italics, etc.). APA, MLA, Chicago, Vancouver and CSE are examples of citations styles.
For this class, you will use the Conservation Biology Citation Style. The journal is using APA 7th, so if you are using EndNote or Zotero, select APA 7th and you'll be fine.
This book contains a lot of information. The sections that are interesting:
Chapter 2: Plagiarism (pp. 5-12)
Chapter 3: Evaluating sources for academic work (pp. 13-24)
Chapter 4: In-text citations (pp. 25-36)
Chapter 5: References (pp. 37-50)
Publication Manual of the American Psychological Association by American Psychological Association