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Select all precedents

Windows shortcut 
CtrlShift{
Mac shortcut 
{

When you select a formula and use this shortcut, this shortcut will select all cells that are referred to directly or indirectly by by the formula(s) in your selection. To remember and understand the word "precedent"  in this case, think of "precede" or "before"— literally, cells that come before.

Related videos

The videos below show how this shortcut can be used.
In this video, we'll look at how to quickly find formulas and trace how they are related to one another, using the concept of precedents and dependents.
In this lesson, we cover shortcuts you can use to select special cells with Go To Special