TIL you can change the background color of conflict marker sections.
Credit: https://vi.stackexchange.com/a/19760
function! ConflictsHighlight() abort
syn region conflictStart start=/^<<<<<<< .*$/ end=/^\ze\(=======$\||||||||\)/
syn region conflictMiddle start=/^||||||| .*$/ end=/^\ze=======$/
syn region conflictEnd start=/^\(=======$\||||||| |\)/ end=/^>>>>>>> .*$/
highlight conflictStart ctermbg=red ctermfg=black
highlight conflictMiddle ctermbg=blue ctermfg=black
highlight conflictEnd ctermbg=green cterm=bold ctermfg=black
endfunction
augroup MyColors
autocmd!
autocmd BufEnter * call ConflictsHighlight()
augroup END
TIL you can sort lines of text in Vi.
:sort<CR>