Hello. You did not say which article the question refers to, which makes it difficult to answer. However, I will try to help you in the best possible way.
The steps to make an animation start with the creation of a story, where the whole narrative is established and where the characters are created. This step is done in a Storyboard, where it is possible to have an overview of all the history and the characters and scenarios.
The second stage consists of actually starting to animate, where characters and colors are given movement. Scenarios and everything that will interact with the characters of the history are also established. It is necessary to use image movement techniques in this case. At this moment, the voices of the voice actors are also recorded and the sound effects are inserted, as well as the animation sonography.
Finally, it is necessary to make necessary corrections and edit the animation.