A strategy is a set of switches to the tools, which are defined in a pre-configured set of options for the synthesis application or the various utilities and programs that run during implementation. Each major release has version-specific strategy options.
Video: See the following for more information:
Vivado Design Suite QuickTake Video: Creating and
Managing Runs.
Select Settings from the Flow Navigator, select Synthesis, and select a Strategy from the Strategy drop-down list, shown in previous figure, and click OK.