Use D to delete from the cursor to the end of the line. dd deletes the entire current line.
Commands you practise
D
Delete everything from the cursor to the end of the line in a single keystroke - no motion needed. It's the fastest way to trim a line's tail.
dd
Press dd to delete the entire current line and automatically shift everything else up. Perfect for sweeping away unwanted lines of code.
Levels
Comment Cleanout (easy): Delete the two marked comment lines.
Truncate and Terminate (medium): Truncate the comment on line 1 and delete the deprecated third line.
Chore Cleaner (hard): Keep only active chores, removing completed ones and truncating details.
Each level opens a real Neovim session in your browser with a start file and a target file. Edit one into the other in as few keystrokes as you can, then race the vimbot's solution.