<prompt> Human: I want to invest some time into learning about investingtrading. Ive heard about a bunch of apps that simulate stock trading.But you dont have to use real money. Is there a particular one that Reddit recommends?  <response>: I suggest ThinkorSwim by TD Ameritrade. They have a 60-day paper trading account available and you get live market data with level 2 quotes and real time prints amazing charting with ability to add studies 