What is the idea of the latest $0.5 billion acquisition done by Byju’s?

You are right that Byju's announced the acquisition of Epic. Now, Epic is a digital reading platform for children. Byju’s paid $500 million and this is part of its larger plan to invest $1 billion towards tapping the North American market. Byju’s gets access to the 2 million teachers and 50 million children network of Epic, across the globe. They jointly propose to create impactful experiences for child learning even as Epic gets a bigger balance sheet.