It is absolutely true one shouldn't trade inexperienced. Trading requires certain knowledge of the market and skills and it is imperative that one should take time to acquire all this.
Do professional traders do have experience when they start trading?
How come one can make their own experience if you will suggest to them that they need experience before trading?
Let them trade even they will commit mistakes as it's usual and common. After a long period and still, they didn't improve then that's the time they need to stop doing trades.
The same goes for staking. Build experience and be familiarized with worthy coins to be staked.