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It is a very simple Wien Bridge oscillator that has thousands of articles about it online. Don't you have a teacher or a textbook to explain it? It is very simple to build, test and demonstrate.
The schematic shown in the task shows a very old 741 opamp. If you look at Wien Bridge Oscillator online then you will see them made with vacuum tubes, transistors and opamps.
We are not here to do your homework for you, and we absolutely refuse to do so. That defeats the purpose of the assignment, as MikeMl said. You need to do the work, show us what you have so far, and where you get stuck. We can then help you get past the part where you're stuck, but you still need to do the assignment. We are not here to be hired to do some lazy student's homework for them.