Some fundamental keyboard shortcuts

Some standard keyboard actions which are valid in all modes are:

S-return
always starts a new paragraph.
C-backspace
remove the containing object or environment.
A-space
insert a small space.
A-S-space
insert a small negative space.
M-A-home
manually set start of the selection.
M-A-end
manually set end of the selection.
M-<
go to the start of the document.
M->
go to the end of the document.
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