The Operations page is your main workspace. This is where you transform your data using operators like Group, Filter, Limit, etc. to get the expected result which later on can be used in the visualisation that you want to build.
Initially this page will show you nothing because you don’t have any selected datasets, thus it will redirect you to the data calendar page. Once you selected a dataset, you can start working in the operations page.
After you selected a dataset, you’ll see one node available in the canvas. You can apply a new operator by left-clicking on the dataset node and then selecting Add Operator to choose the operator. You can refer to the operator reference to see the full list of available operators.
The workflow chain is a node representation of your operation history. From the workflow chain, you can identify your initial dataset, operators that have been applied to your data, and other information like meta datasets that were joined with your main dataset.