Chart is one of the most customizable (and widely used) Redash visualization types. Select Chart in the Visualization Type field, and you will get to the chart menu. The chart menu has four tabs: General, X Axis, Y Axis, and Series. Let's start with the General tab:

The first thing you should select is the Chart Type. The available options are Line, Bar, Area, Pie, Scatter, Bubble and Box.

After selecting the suitable chart type, move on to selecting the X column and Y columns (note that you can select more than one column for the Y Axis).

Toggle the Show Data Labels checkbox if you want to display the value of each datapoint on the point itself inside the chart.

Group by column is used to define categories for the chart. For example, you have a line chart that represents daily active users per country; selecting the country as group by column will create a separate line for each country.

When Show Legend is unchecked, this disables the Legend display on the top right corner.

When Stacking is selected, it stacks values one on top of the other (for different categories).

 Considering Normalize Values to Percentages, as the name suggests, it normalizes the values to 100%.

After you are finished with the General tab, we can move on to customizing the X Axis:

The Scale is the most important one. Here, you define whether your X Axis is of datetime, Linear, Logarithmic, or Category scale.

Name is the X Axis' name.

Regarding Sort values, in come cases (not when using datetime), you want to sort the X Axis values (when the Scale is Category). If so, toggle this checkbox.

Show Labels shows the labels of values along the X Axis.

The following is a visual of the Y Axis tab:

In addition to scale (which you also had in X Axis), this allows you to set the min/max value (in case you're not interested in automatic discovery based on your data).

In the Series tab, you can control the colors and labels of your series (especially when you have more than one).