https://www.stalliongaming.com/blog/knowing-keyframe-animation-and-using-it-in-videos/

keyframe animation – Set Key

Animate objects or skeletons by setting markers (keys) to point timing and position.
Keyframe animation allows you to transform objects or skeletons over time by setting keyframes. for instance , you’ll keyframe the joints and IK handles of a character’s arm to make an animation of its arm waving. you’ll set keyframes (also referred to as keys) by selecting an object and selecting Key > Set Key from the Key menu within the Animation menu set or pressing S on the keyboard.
Keys are arbitrary markers that specify the property values of an object at a specific time. Setting keys is that the process of making the markers that specify timing and action in your animation. Keyframe Animation is that the process of making and editing the properties of objects that change over time.
For a brief video that explains the fundamentals of keyframing animation, see the Animation within the 1-Minute Startup Movies. For a tutorial that explains the fundamentals of animation, see Animating an production line – Part 1: Keyframe animation.
Once you create an object you would like to animate, you set keys that represent when the attributes of that object change during your animation. Setting a key involves moving to the time where you would like to determine a worth for an attribute, setting that value, then placing a key there. In effect, you’re recording a snapshot of the attribute at that point .
You can rearrange, remove, and duplicate keys and sequences of keys. for instance , you’ll copy the animated properties of 1 object onto another, otherwise you can stretch a piece of animation over a extended period of your time than you originally keyed.
See Set Keys and Edit Keys for information on the way to create keyed animation.
Topics during this section
• Keys
• Keyframe Animation and therefore the Graph Editor
• Set keys
• Edit keys
• Edit curves
• Driven keys
• Breakdowns
• Inbetweens
Animation curves
Use the Graph Editor to control animation curves. Animation curves are how of showing how keys (represented as points) move through time and space. Each key has tangents that permit you control how the animation curve segment enters and exit a key.
The Graph Editor is out there as a panel within the scene view or as an independent window. to put the Graph Editor during a scene view, select the scene view during which you would like the Graph Editor to seem , then select Panels > Panel > Graph Editor. To open the Graph Editor as an independent window, select Windows > Animation Editors > Graph Editor.
The Graph Editor works only with keys and animation curves, so certain sorts of animation aren’t viewable here. Expressions and inverse kinematics aren’t available for editing within the Graph Editor.
3D Keyframe Animation
Keyframing is that the simplest sort of animating an object. supported the notion that an object features a beginning state or condition and can be changing over time, in position, form, color, luminosity, or the other property, to some different final form. Keyframing takes the stance that we only got to show the “key” frames, or conditions, that desribe the transformation of this object, which all other intermediate positions are often found out from these.