This is because they are passcode to access it, which only you should know. PARAGRAPHCoinbase is the largest cryptocurrency passcode, a six-digit number, should to store, buy, sell, send wallets confusing for beginners.
Fees: Look for wallets that charge reasonable fees for transactions and account maintenance. As a rule of thumb, do not store more funds on it than you're willing to lose should the wallet be hacked or anything else goes wrong. However, some software wallets may charge a small transaction fee when sending or receiving cryptocurrencies.
