All employers have a responsibility to provide a safe working environment.
All employees have a responsibility to uphold and contribute to a safe working environment.
Even visitors, contractors and volunteers have responsibilities when it comes to WHS.
Both you and your employer have responsibilities under the legislation:
You
https://www.safework.nsw.gov.au/legal-obligations/worker-obligations
Your employer (the PCBU)
https://www.safework.nsw.gov.au/legal-obligations/employer-business-obligations
Read about your responsibility and make a list of what is expected of you.
Then read about your employer's responsibilities and make a list of what is expected of them.
The librarian asks you to lift down a box of books from a shelf above head height.
The student you are supporting is in a bean bag and needs lifting into their wheelchair.
The support staff need a quick staff meeting and want to do it at recess; they ask you to do duty in your recess break to cover their absence from the playground.
Staff ask you to set up a challenging obstacle course outside by yourself while they get sunscreen on the children after morning tea
What does it mean to have a duty of care and what is the primary duty of care of the employer?
https://www.safework.nsw.gov.au/legal-obligations/employer-business-obligations/primary-duty-of-care
Read more on the link above and discuss with your classmates.
Refer to the Workplace Health and Safety Policy and Procedure to support you in answering Project Part 1 Task 1 Rights and responsibilities of workers.