Abstract: Embodiments provide data handling methods and systems for data lakes. In an embodiment, the method includes accessing a plurality of data elements from a data lake associated with an organization. Each data element is registered with one or more metadata objects through a metadata registration The metadata registration is performed using a graphical user interface by either receiving a manual input from a user or using a REST application programming interface. A unified metadata repository is formed based on the metadata registration of the plurality of data elements. Moreover, complex computations of the plurality of data elements for various data processing operations and business rules are performed. Graphical processing of the plurality of data elements in the data lake is performed for analyzing entities and their relationships to generate insights. The method further includes performing an analytical operation based at least on machine learning algorithms and deep learning techniques.