Starting with Animation Fundamentals,It includes basic principles of timing and spacing,Stretch and squash,Overlap
For understanding what is timing and spacing I started up with exercise by assuming a car for different situations,That was the first time I started up with animation in 3d.For example :

• Slow out
• Slow in
• Slow out and slow in
• Slow out and a sudden break to speed
• Slow out and hitting treee
• Car coming in speed and hitting tree