This will show you how to use ssh with keys for authentication. this has a couple of advantages over using passwords:
1) you can enable key only logins.
2) you dont need to type [or remember] passwords
You will need two machines (though you probably know this already):
on yourmachine.local open a terminal and type:
it will ask you a few questions and will ask for a password. you could enter one, or you could leave it blank. if you are on a mac it will remember what ever you use, so its probably best to use a password..
Once yourmachine.local has generated a key you need to edit the ssh config on yourmachine.local
paste the following into the file:
Host remotehost.com User username IdentityFile ~/.ssh/id_rsa
The last line should be the name of the file you created in the step above.
Finally, you can run the following command to store the generated key on remotehost.com
ssh-copy-id -i ~/.ssh/id_rsa.pub email@example.com
ssh-copy-id will ask you for your user password, and will store your key in the ~/.ssh/authorized_keys file on remotehost.com.
ssh-copy-id isnt available by default on a mac, but you can install it a couple of different ways: see this blog post to find out how to install ssh-copy-id on your mac
You should now be able to log into remotehost.com without entering the passwords!
If you run into problems then you can enable debug mode to see debug information
ssh -v remotehost.com
You should be able to figure out whats happening from the messages displayed.