How to connect ssh key for bitbucket in Ubuntu?

Question

linux

OpenSSH_7.6p1 Ubuntu-4, OpenSSL 1.0.2n 7 Dec 2017
debug1: Reading configuration data /home/***/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to bitbucket.org [18.234.32.155] port 22.
debug1: Connection established.
debug1: identity file /home/***/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/***/.ssh/id_rsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4
debug1: Remote protocol version 2.0, remote software version conker_1.1.15-49a70a8 app-153
debug1: no match: conker_1.1.15-49a70a8 app-153
debug1: Authenticating to bitbucket.org:22 as 'git'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: [email protected]
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server ->client cipher: [email protected] MAC: compression: none
debug1: kex: client->server cipher: [email protected] MAC: compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ssh -rsa SHA256:****************
The authenticity of host 'bitbucket.org (18.234.32.155)' can't be established.
RSA key fingerprint is SHA256:******************************
Are you sure you want to continue connecting (yes/no)? no
Host key verification failed.

Answer 1

ls -l /root/.ssh?
ls -l /home/***/.ssh?