Tweens

Tweening comes from the phrase "in between". What you need to do is this:

1. Create an object on the stage in a layer. Let's go with a rectangle.

2. Select the object and hit F8 or go to Modify > Convert To Symbol. You can apply Classic and Motion tweens to symbols. Shape tweens can be applied to vector shapes. The difference between Classic and Motion tweens will complicate things - Animate gets complicated quickly. There are almost too many ways to do things in the application. So I'm going to make this as simple as possible for you.

3. Click on a frame further down the timeline - let's say frame 50.

4. Hit the F6 key - this inserts a KEYFRAME represented by a little black dot in the frame.

5. In this 2nd keyframe (frame 1 already has a keyframe by default) move and/or scale the symbol (your rectangle) to a different location/size.

6. Hover your cursor over any of the frames between frame 1 and frame 50 and right-click.

7. In the context menu, select Create Classic Tween.

8. Playback your animation to see your rectangle move/scale.

To rotate something using a tween, click on a frame that has a tween already applied. Use the tween you just created from previous steps. Look in the Properties Panel where you will see an option to rotate and a drop-down menu where you can select from Auto, CW, and CCW. Eneter a number of rotations or leave the default as "1".

This is the very basics of tweens in Animate.

There are yet better ways to approach this such as having your rotating wheel nested in side a symbol so that you can populate the stage with multiple rotating wheels very easily. But that's another forum post for another day. Baby steps my friend. Baby steps.