If you've never tried your hand at animation you might be surprised and distressed to find how much adding up and dividing by twelve is involved. To be fair, working on a program like Animate (nee Flash) where everything is easy to move around, you can leave a lo of the maths behind and eye it all. But it's a pretty surefire way to get very confused, especially if you're timing your work to music or have another time constraint.
Back in the day (and I guess still on hand-drawn features) you'd use a Dope Sheet to keep track of all this:
I'm working on the animated video showcasing the titles of the shortlist for the Waterstone's Children's Book Prize. This is the post-it note that is currently running my life:
The cat is helping. I somewhat miss the look of a real Dope Sheet which convey a certain busy authority (I must have a pile somewhere) but I'm also thankful that most of the maths I have to do can fit on a 5cm square sticky.