or do you need books also to get missing info from videos?
If you set up your switches with these setting
Aaa new model
Aaa authorization exec default login local
Aaa authentication default login local
And line vty 0 4 Login authenticated default
Ip http secure-server creates default 1024 rsa keys
Then after a while you add ip domain-name And generate rsa key 4048
Which rsa keys will be used when you ssh vis putty? Will you need to change command under line vty to make it login local?
Assuming no aaa server was setup yet