Hello everyone!

I am working with a dataset that looks similar to the **sample_df** below:

```
sample_df <- data.frame(
Date = c("2018-01-01", "2018-01-02", "2018-01-03", "2018-01-04", "2018-01-05"),
A = c(3304, 3223, 3138, 3090, 3088),
B = c(5951, 5972, 5981, 5957, 5973),
C = c(1629, 1592, 1578, 1566, 1577),
D = c(2380, 2401, 2408, 2402, 2399)
)
```

I want to see if there is a relationship between column **A**, **B**, and **D** by plotting a line graph with with three lines representing A, B, and D columns (we are gonna ignore column **C** for now). Note that the Y-axis should represent the "**Date** and the X-axis should be the unit of column A, B, and C. The graph should also have a legend and a way to distinguish three lines.

I reckon that I am gonna have to use "ggplot" but I can only create three separate line graphs. So it would be great if you could teach me a way to combine all three on a same plot.

Thank you!