Doubt regarding GPT-3

Well don't worry it's not that hard. First you should have a good understanding of deeo neural networks. What people are doing is Fine Tunning. You can fine tune your pre trained BERT model to work on your dataset, and you can do the same with gpt-3. It is trained on super powerful clusters of GPU with trillions of operations per second, and is trained on over 40GB of text data.