There are a number of ways to delete from the cursor position to the end of
the line. Generally when I am doing this, I want delete to the end of the
line and then start typing something different. Perhaps the best way to do
this is by hitting C. It deletes to the end of the line and then leaves
you in insert mode. This also makes for easier repetition with the dot
command.
This is synonymous with hitting c$.
See :h C for more details.
h/t Dorian Karter