So, the NodesConstraints were developed as the "first generation" animation tool. There are better tools since.
If your goal is to do animation, then go with VNGE and forget about NC completely. Most pre 2022 tutorials are outdated at this point, as they focus on older approaches to using this tool.
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VNGE is a collection of utilities.
What you want is its Timeline component. Tinker with it for 30 minutes and you should get it.
When you do animations, split animations into different clips: one for body, one for face, one for camera. Don't put everything into one clip. Have transition clips to move from one scene to another.
Otherwise,
gzrtjhgtyhjljk nailed it.