To set the tangent type
The default type for tangents is Auto. For more information on all the settings in this task, see Graph Editor Tangents menu.
If you selected a key on a curve, only the curve segments before and after the current key acquire the specified tangent type.
To change the tangent color
In the Color Settings window, expand Graph Editor and set a new color for the Secondary Selection Color.
To set the tangent’s weight
Tangent weights dictate the amount of influence a tangent has over a curve segment. See Non-Weighted and Weighted Tangents.
Curves are non-weighted by default.
Non-weighted tangents have short tangent handles that only control the angle of the tangent.
Weighted tangents have long tangent handles that control the angle and weight of the tangent. Weighted tangents provide finer control over your animation curves.