I agree with others that 3 and 10 percent triggers are too low.  Take today for instance, just in the top-10 on CoinMarketCap, three of the top ten coins are below a 3-percent loss... and that doesn't even include the intra day range.

I think you're asking for guidelines but in my experience each trade needs to be approached differently.  If you're just starting I'd recommend keeping a trading journal and write out your hypothesis (why you think it's a good trade) and before you purchase list out your stop-loss and sell targets.  And... none of these should be guessed, there should some logic behind your targets.