While looking in to the 12 principles of animation I found various videos that helped explain them very well, more so than reading because it had someone explaining the movements as it happened on screen.
I found quite a few videos and they were all helpful, there was a whole series on youtube about them that I watched but the video above is reduced and easier for a simpler watch.
Here the first episode of the playlist of the more intensive one aswell-
And also a little interesting read too!
All the sources were quite interesting to learn about as you begin to see the things being applied to any animation you watch after reading up about it.