Insertion sort unable to understand ,what is the logicand i am unable to understand through that video ,can you helpme out concept is not clear to me can you help me and can you suggest a book for c++ that can help me to bulid my concept more stronger

Can you help me plz

Insertion sort unable to understand ,what is the logicand i am unable to understand through that video ,can you helpme out concept is not clear to me can you help me and can you suggest a book for c++