Buffer

Key Binding Mode Description
SPC b 1 Normal switch to buffer with number 1
SPC b 2 Normal switch to buffer with number 2
SPC b 3 Normal switch to buffer with number 3
SPC b 4 Normal switch to buffer with number 4
SPC b 5 Normal switch to buffer with number 5
SPC b 6 Normal switch to buffer with number 6
SPC b 7 Normal switch to buffer with number 7
SPC b 8 Normal switch to buffer with number 8
SPC b 9 Normal switch to buffer with number 9
SPC b p Normal switch to previous buffer
SPC b n Normal switch to next buffer
<Tab> Normal swtich to next buffer, equal to SPC b n
<Shift-Tab> Normal switch to previous buffer, equal to SPC b p
SPC b d Normal delete current buffer
SPC b k Normal kill current buffer

buffer number

Check the details of a certain key binding, e.g., :verbose nmap <Leader>bp:

:verbose nmap <Leader>bp
n  <Space>bp   * :bprevious<CR>
        Last set from ~/.vim/plugged/vim-better-default/plugin/default.vim

Show all buffers via :files, :buffers or :ls, see :h :buffers.