Exercise 8:  Descending

EASA requirements: - 

(A) entry, maintaining and levelling off; 

(B) levelling off at selected altitudes; 

(C) glide, powered and cruise descent (including effect of power and air speed); 

(D) side slipping (on suitable types); 

(E) use of instruments for precision flight

Additional reading

FAA Airplane Flying Manual 

Disclaimer:  The material presented in these YouTube videos should not be used in place of actual ground or flight instruction. Consult a certified flight instructor before attempting to conduct any flight maneuvers. 

The following training videos supplement the flight training syllabus in the Flying Training Manual

Exercise 8:  Climbing & Descending