There are two ways to accomplish this easily.
1. Change the marks card type from Automatic to Line.
- Use Show Me (upper right) and select the icon for the line chart.
Additionally, here is some information on Discrete vs Continuous Pills which cause many new users confusion.
Discrete = Distinct buckets like apples, oranges, peaches, etc
Continuous = Any values on an axis like percentage, sales, etc
For dates, discrete dates are parts of the month like days (1, 2, 3...), months (Jan, Feb, March...). A continuous date would be Jan 2019, Feb 2019, etc (these are truncated dates because they include the entire date starting from earlier in time to later in time.
In the picture, the list in green is continuous and the list in blue is discrete.