Doing a particular activity or task can represent:
That actual activity in your life, usually something you've done recently or is on your mind for some reason
A completely different activity, but with a similar characteristic—for example, dreaming that someone steals your keys can represent losing your self-identity or someone "crossing your boundaries"
Your feelings during that activity in real life recently
A fear or hope of something similar happening in real life, or your subconscious mind exploring what it would be like
Possible dream symbol meanings in the dream dictionary are suggested. No "standard meanings" exist because dream meaning is subjective and specific to the dreamer.