So my question is: Is there such thing like low risks strategies? If yes, what could be an example of that?
Yes, there is but not totally safe. Minimizing your amount on stake. In an event of loss, those losses can't hurt your wallet. But on the other hand, in an event of winning, except that it's slow progress even the coin you choose is mooning.
But the question, is that a good strategy? For me, yes if you are in the testing phase. Then soon challenge yourself to manage well a decent amount in trading.
After that loss, stress, exhaustion, etc you will eventually know what's the best strategy to do.