vim not allowing backspace

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Explanation

The ‘backspace’ setting controls this behavior.

From the help page:

Influences the working of <BS>, <Del>, CTRL-W and CTRL-U in Insert
mode.  This is a list of items, separated by commas.  Each item allows
a way to backspace over something:

value   effect
indent  allow backspacing over autoindent
eol     allow backspacing over line breaks (join lines)
start   allow backspacing over the start of insert; CTRL-W and CTRL-U
            stop once at the start of insert.

Changing backspace behavior

Try adding the following to your .vimrc:

set backspace=indent,eol,start " backspace over everything in insert mode

A short-hand version of the same command:

set backspace=2

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