General questions

Hi there. I'm a new bee here. I have been on and off day trading common stocks but never trade ETFs before. I have followed USO (United States Oil fund) for quite some time since its price keeps falling. My question are: Can I day trade this USO stock? Are there hidden rules trading this type of securities? What should I know about day trading ETFs?

Thanks in advance.
General questions for trading must be how one can get proper knowledge about analysis and trend variations
and one should give utmost importance to the fundamentals
one should always take an mentor and also follow their idol and try to achive their goal in this trading world