In a tutorial a guy split a line like this:

I have try left click and right click but nothing works.


That is called a reroute node.

Hold RMB (LMB in 2.7x) and Shift while dragging your cursor over the noodle(s) to create one.

enter image description here

Note that its only use is making node setups less tangled and easier to work with, it doesn't affect the result of the node setup at all.

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  • $\begingroup$ If this answered your question, feel free to mark it as accepted :) $\endgroup$ – gandalf3 Jun 26 '14 at 5:16
  • $\begingroup$ It's right mouse button in 2.81 $\endgroup$ – Stephan Ahlf Nov 20 '19 at 18:06

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