Sort

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Sort[list]

sorts list (or the elements of any other expression) according to canonical ordering.

Sort[list, p]

sorts using p to determine the order of two elements.

Sort uses OrderedQ to determine ordering by default.
You can sort patterns according to their precedence using PatternsOrderedQ:

When sorting patterns, values of atoms do not matter:

See also ReverseSort.

ReverseSort
TakeLargest