it is also good idea to try a few games in a free mode and create a strategy. Then to apply it with real bets. It can be done on Fairspin without any problem
free mode is not just in your casino but in all casinos and free mode is only for playing when the player doesn't have the funds or doesn't want to risk the funds, and I never thought there was a strategy in slots only usually players will increase the bet amount when they feel they will get win even though the chances of getting it wrong are as big as getting it right.
It seems I have not said it that only Fairspin has free mode. I said that it is good idea to try and find out what game you like the most, to see how everything works and then start playing with real money and win.