You have intra-day trading and intra-day investing. 

Different goals. 
Different rules. 
Different mindset. 
Different money. 
If you can, do both. 

$SPY $SPX $QQQ $VOO $TSLA $AAPL $AMD $NVDA $FSLY $MSFT $FB $GOOG $SHOP $IWM $T $O $VTI $VGT