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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.

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Tip: How to trace formula relationships
In this video, we look at how to quickly find formulas and trace relationships, using the concept of precedents and dependents. A great way to quickly understand an unfamiliar worksheet.