Duplicate Lines in Sublime Text
To quickly duplicate a line of code, place the cursor anywhere in the line and hit Cmd–Shift–D(Mac) or Ctrl–Shift–D (Windows).
Quickly Write Comments in Sublime Text
Comments tell the web browser to ignore a section of code. We use them to document and debug our code.
To comment out one or more lines of code in Sublime Text, place the cursor anywhere in a line (or select multiple lines) and hit Cmd–/ (Mac) or Ctrl–/ (Windows).
Use the same keystroke on an empty line to insert a blank comment.
