How to configure GitHub SSH CORRECTLY

In this video I show how to configure GitHub (GitLab, BitBucket, etc.) SSH correctly:

1. Create a key-value pair using the ED25519 algorithm, that is done with the command `ssh-keygen -t ed25519`. The defaults are ok.
2. But! Make sure that you add a passphrase! This is important
3. Add your public key to GitHub via settings.
4. Configure your SSH Agent. This can be tricky in itself, so I might make a full video about this one if there is enough interest.
5. Add your decrypted private key to the agent with `ssh-add ~/.ssh/id_ed25519`.

These steps work exactly the same for GitLab, Gerrit, BitBucket and many others. There is absolutely no difference.

A good way to test if things are working correctly is to try to `git clone` a random repository SSH URL. GitHub will say:

Permission denied (publickey).
fatal: could not read from remote repository.

You could use HTTPS for cloning, but for proper authentication only SSH works.

00:00 intro
00:17 Git clone with SSH: permission denied
00:34 Private and public key pair
01:00 Generate a key pair with ssh-keygen
01:44 Use the ED 25519 algorithm
02:08 Add public key to GitHub (GitLab, BitBucket)
02:38 But you have to type the passphrase every time!
03:01 Use the SSH Agent
04:41 ssh-add to add keys to agent
05:08 Simplify everything with SSH configuration file
06:31 Going beyond the basics
06:53 Contribute by subscribing