Hello, when we choose the expiration time of our receive adress, after this end time, we can always receive some bitcoins on it or not ?

[what informations about it should I save and keep in security in my external hard drive ?]

Hello, if I want to backup my Bitcoin Core wallet on an external hard drive to open it or to recover it on a new laptop after to have download Bitcoin Core on it or any bitcoin wallet software, well to keep my bitcoins with me and don't loose them, what informations about it should I save and keep in security in my external hard drive ?

How do i install bitcoin core update without losing my bitcoins ?

Hello, I wanted to know about electrum, how to synchronize your wallet created on your PC with your smartphone on the android version of the software ?

Hello, on Bitcoin core 0.21.1, when I write the commands on the console to see my private key, I am told that the type of my wallet does not support this command. It is an encrypted wallet with passphrase. Can someone tell me how to get my private key ? Thank you.