Choose a small transformation with a known result, such as trimming a line of text or formatting a tiny JSON object. Connect one input, one transform, and one output in Workflows. Write the expected result before you run it.
Then try an empty input and a malformed one. Observe whether the workflow returns a clear result, a useful error, or an unexpected partial output. Save a working copy before adding a second step. Avoid external writes, messages, or credentials in the first exercise.
The lesson is data flow: what each node receives, changes, and passes on.