for one single word, the job is quite easy: we just do a 'cw'
what if I select a certain text and I want to replace this block with one word?
obviously I can do a 'x' and then 'i', is there a one key-stoke solution?
in other words, after I select the block in visual mode, what is the fastest way to do 'delete' and then enter insert mode?
any idea?