I learned org mode following the compact official instruction
** Lord of the Rings My favorite scenes are (in this order) 1. The attack of the 2. Eowyn's fight with the witch king
the command M-RET works which Insert new item at current level. With a prefix argument, force a new heading (see Section 2.5 [Structure editing], page 3).
but M-S-RET does not work as excepted to insert a checkbox, otherwise perform identically as M-RET
I understand M-S-RET as Meta + Shift + Return
How could I solve the problem?