Another way to change the interpolation is to right click on the mouse and click
Some are relevant but for things such as opacity is a temporal interpolation rather than spacial
A hold key frame -
This has removed all interpolation.
This could be used for a second hand of a clock.
Or something that flashes or blinks.
If you double click on one layer it opens it up as separate.
Also if you want to alter the time equally between each key frame, select and hold down ALT
If you want to make the shape transform round a circle, copy and paste the shape desire from illustrator.
Copy in illustrator, select layer, press p, press stopwatch, and paste.
Once you have motion key frames, this is how you get it to rotate the other way, in this example, anti clockwise.
If you have a layer that is the same size as the composition, with the layer selected, the select ellipsis shape tool, draw the shape and it creates a mask
Path - shape of mask
Feather - soft edge
Opacity - like layer opacity but with layers can be useful
Expand/Contract -
mask path property is: M
Alternative to using a mask
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