Most time because of the lent in the numeric of wallet address most newbies and even old members sometimes make mistakes in wallet address which often time lead to loss of the fund and be aware of the irreversible nature of cryptocurrency transaction to avoid this always make sure you double-check the wallet address properly before clicking send.
We always need to double check the recipient address if we are sending funds are our own address if we want to send it to someone else to receive funds as reduction in any digit could be problematic for you.This is not the case with only cryto addresses but normally when we want to send our funds through our bank account we always double check the account number,phone number or branch code so as to avoid any problems and funds are send/received without any hinderace.
For your convenience the wallet always provide you copy icon on the side of the address and you can copy it from there directly or simply copy it and place it in one place like sticky notes or notepad and then simply send it from there but when you have filled the address do one thing to cross-check it once with the original one which is best you can do.The other option is qr code but don't mix them.
Security always come with responsibility on our own ends and we can't lose the rope at any end otherwise the survival chances are less.We learn from our mistakes but don't do the silly ones which could cost you much.Just re-check everything once.