How are hybrid keyframes created in After Effects?

Question

As I understand, there are 2 types of keyframes in AE: basic (Linear, Bezier, Continuous Bezier, Auto Bezier, Hold) and hybrid ones. Here is a picture from the site I read:

It’s clear for me about the basic ones, but I’m totally confused with the hybrid keyframes. There's a quote from the same site:

By default, a keyframe would use only one type of Temporal Interpolation (linear for example). But in some cases, a keyframe might show dual nature as well. Which means one half of the keyframe is Linear (incoming/outgoing) while the other half could be Hold or Bezier (e.g. Toggle Hold or Ease In/Out settings). This is something that I call hybrid keyframes.

As I understand it, the right part of the key should show the previous key, and the second part should show the subsequent key. But this doesn't happen:

Apparently I misunderstand it. So, how does this actually work? Thank you very much!

Answer 1

I think only the symbols shown in your diagram are the available ones in after effects. If you make three temporal keyframes:

1. linear
2. easy ease
3. auto bezier

Then change the middle one (2) to be a hold keyframe, you'll see one of the hybrid examples shown (hold ease in).

In general, the keyframe symbols are a great useful way to get certain kinds of motion working quickly, but it's often clearer to understand what's going on by separating dimensions and looking at the graph mode.