After splitting aces, the common rule is that only one card will be dealt to each ace; the player cannot split, double, or take another hit on either hand. Rule variants include allowing resplitting aces or allowing the player to hit split aces.
The common practice after splitting aces is to deal only one card per ace. Players are prohibited from further actions like splitting, doubling down, or taking another hit on the hands. Some variations allow for additional actions such as resplitting aces or hitting split aces.