In my opinion without your own responsibility you can`t learn to predict. You can train, but the price of such predictions is zero. I think that until you don`t ready to risk your money - you can`t advice someone to risk.
Yes, i lost my money with free spins, and i`m sure that it is the main purpose of such bonuses - make the gambler spend his own money to get the profit from the free spins.
There is no better teacher than self experience. You can not teach someone without you knowing that thing through experience. If you must predict, you must have experience in predicting game or otherwise, so as to be able to predict for others. So therefore, you must have spent your resources to learning how to predict which means it is not free.
When betting, it is advised to use spare cash you can afford to loose same advise is applicable herein on this platform. So if you loose funds in the course of betting it would not bother you much because of the fact that the funds are spare Cash and nothing to worry about.
That's why it is always advised to gamble responsibly.
Self experience is the best thing i know. But when you pay for this experience - it costs much more if you get it for free. When you don`t ready to pay for experience - it costs nothing. I agree that you have to bet the part of money that you`re ready to lose, but anyway - you have to risk money if you want to get positive feedback from your predictions.