with Andrej’s article I found some nice tips & tricks and the Vim manual for diff tasks. Some useful commands,
* “vim -o one.txt two.txt three.txt” (for horizontal split), “vim -O one.txt two.txt three.txt ” (for vertical split)
* go to the next diff point ” ]c “; go to previous diff point “ [c “
* merge to original “do“, merge from original “dp“.
Where text highlighted red will display text which doesn’t match from the files being compared.