How can I quickly delete a line in VIM starting at the cursor position?
Solution 1:
(Edited to include commenter's good additions:)
D or its equivalent d$ will delete the rest of the line and leave you in command mode. C or c$ will delete the rest of the line and put you in insert mode, and new text will be appended to the line.
This is part of vitutor and vimtutor, excellent "reads" for vim beginners.
Solution 2:
Use D. See docs for further information.
Solution 3:
You might also be interested in C, it will also delete the end of line like D, but additionally it will put you in Insert mode at the cursor location.