One tool. Three ways in.
A command tells your CAD software which operation to begin. In AutoCAD’s Drafting & Annotation workspace, you can start a line from Home → Draw → Line, by typing LINE then Enter, or with the default alias L then Enter. Choose one route; you do not need to draw the same line three times.
Read the next question.
The command starts the operation. A prompt asks for the next piece of information. Your input answers it. After starting LINE, expect a request for a first point, then a next point. Read that prompt before typing another command name.
LINEThenEnterThis is an explanation of command entry, not a live AutoCAD command line. You do not need to open a drawing to read this guide.
A sequence is different from a shortcut.
L, then Enter means two actions in order. A shortcut such as Ctrl + S means hold Ctrl while pressing S. Aliases can be customised, so an installation may differ from the documented default.
Spacebar can confirm ordinary command-line input, but is not interchangeable with Enter everywhere: text entry and grip editing have other behaviours. These guides use Enter to keep the sequence clear.
Finish deliberately.
At LINE’s request for another point, Enter ends the line sequence. Esc cancels the active command; it does not undo geometry already created. If the prompt is unexpected, stop and read it rather than entering more values.
You should be able to tell the operation name from the question it asks. Next, explore the difference between a point’s position and a movement from a previous point.
Check the source
Command behaviour checked against the official references below. Interface details can vary by version and configuration.