Snap

Snap = Shift + S.

*There are few different snap types.

- Selection > Grid
- Selection > Cursor
- Selection > Center
- Cursor > Selection
- Cursor > Grid
- Cursor > Active

IK Constraint

IK Constraint = Select "control object" and shift click lower bone and Shift + I (pose mode).

Border Render

Border Render = Shift + B.

Previous render

Previous render = Above render window or UV/Image editor (render result) hit J.

Track to Constraint

Track to Constraint = Select object and then shift select target object > Ctrl + T or Object > Constraint.