This stands for “Return to Player” and is expressed as a percentage. The figure simply represents the amount of money a player can expect to win from their bets in casino slots or other games. If you play a game with an RTP of 93%, then for every £1 you bet you can expect to receive £0.93 back.
Slot volatility represents how often a slot triggers a win and the typical size of the wins. High volatility slots will pay out less frequently, but have bigger wins, meanwhile a low volatility slot will pay out more frequently with smaller size wins.
Some slot games allow you to purchase a bonus, this means you can immediately access the bonus features of the slot.
There is no skill, each spin is random.