Set tEDITING KEYS IN CURVE EDITOR AND F CURVE INTERPOLATION TYPES

View the tangent types,

Enter the curve editor, highlight the key frames you want to move click and then proceed to drag to the necessary area. Hold down CTRL to move only on 1 plane and you may move up and down in this, you have locked the key in time so they may only move in VALUE. Left and right may change the time so that you also do not change the keys value.

Hold down shift you are able to drag and jump a key frame to a different place.

Your tangent type here is auto and that gives you an automatic smooth animation. Auto may correct you if you go too far from what you have set as well. But sometimes you may want to overshoot.

Set to spline allows you to make a custom tangent.

This means the animation will move quickly at first and the slowly at the end.

Set to slow will do the opposite of the tangent that is above (set to fast).

In these options you do not have access to your tension handles as you do in auto.

Step allows you to focus on the timing and poses of your animation without you having to worry about the interpolation.

Linear will allow you to maintain a constant speed.

This is set to smooth, which creates overshoots.

But remember to  go to auto and spline to access your tangents for more control.