Expected Answer: Not always. Flattening merges all layers into one, which is irreversible. Better to:

Expected Answer:

| Question | Answer | |----------|--------| | Shortcut for deselect? | Ctrl + D (Cmd + D on Mac) | | Shortcut for free transform? | Ctrl + T | | How to duplicate a layer? | Ctrl + J | | How to merge visible layers? | Shift + Ctrl + E | | What does Ctrl + I do? | Inverts the selection or image colors |