Harvard style in text citation and reference list at the end for any must use online (sources) try use few as possible

Question for (1000 )word essay
With the Covid-19 outbreak, there has been a great increase in the number and variety of online courses available to students. This has been welcomed as a great opportunity by many, although, some see these courses as less effective. What are the advantages and disadvantages of studying an online course?

Structure:
Introduction (with a hook at the beggining)

Paragraphs 2 each talking about advantages and disadvantages