Which free paper trading site do you use?

I did try to explain generally that investing (at least properly) is quite complicated. Even the recent changes in tax laws have impacted decisions to hold or sell stocks long term versus short term. I think he can grasp the concept of capital gains tax rates at different income levels versus ordinary income tax rates, but the ability to properly factor them into investing decisions adds another level of complexity.

Unfortunately, DS' self-directed exploration often ends up requireing my input at some point and sometimes I just want to pass the buck.