This video is so good as introduction and overview.
Thank you, Unity!
Then, there is my suggestion about Timeline.
Default Playables is Unity official asset about Timeline as you know.
I love this asset because Timeline Playables Wizard is so valuable tool and starting point for customization Timeline.
I think this asset’s content should be migrated at sample page of Timeline package on Unity Package Manager.
While one sample contains already customization content, Default Playables also have versatile examples more.
(But the wizard might need to be updated today.)
This is my feedback, thanks.