Read a few articles about genetic modification. They could be from the place you were browsing, news articles you find through Google, a library reference database such as Britannica Academic, or even a Wikipedia article.
You want to get a bigger picture of the issues around the topic. A quick search in different places shows more specific issues and things related to genetic modification.
|Search Results / Article
|search on genetic modification filtered to news
|genetically modified salmon, eating genetically modified organisms, GMO cows, genetic modification to mitigate climate change, gene modification to cure Alzheimer's
|Britannica Academic (library database)
|search on genetic modification ⇒ "genetic engineering" article
|the historical background, applications in humans and plants, controversy around patenting engineered organisms
|"Genetic engineering" article
|history of genetic engineering; the process; applications in medicine, agriculture, etc.; regulation; controversy around it
Based on the background research you've just done, narrow in on a more specific topic. Your project will be much more manageable if you focus on one piece of the larger topic. Here are some examples of narrower takes on the genetic modification topic: