It's for them to experience that, if they're not going to notice the risk that they will take, it could pay them a lot.
Those that are not used to futures much better not to get involved on it. Or if they want to try, just do it as if you're gonna lose the money no matter what happens.
Spot and futures trading both have risks. In the futures you'll need more knowledge compared to the spot but that doesn't mean that spot trading is easy because as others said buy low sell high but without any knowledge you'll lose.
Both of them are hard and as you have said requires risk. The risk is just much higher in futures.
In spot, it's true that it doesn't guarantee you'll win your trades there because it's also hard just how it's risky with the futures although it's just lessened in that manner.
Also in the futures even if you have the fundamentals like a learning indicator you still do not have a 100% winning percentage so both of them have risks and only to lessen them with experience and knowledge.
It's just best to avoid it.