Nice!, Be careful not to give your profits back to the market. When I had early success I quickly gave everything back because I thought trading was very easy.

Yes, PDT rule applies to Robinhood. Actually by default it does not allow you to place a 4th trade in 5 consecutive trading days. This restriction is optional and can be removed but I guess it is good to keep it that way. I have Instant and I guess it is the same for cash account as well.

Depends if you have the Instant version, which it IS applied. Or if you have the normal cash account then No, theres no pdt rule

Thank You!