[NOTE: GitHub SSH Keys] @ 40:55

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He didn't explain this part fully. Here's what you actually do:

1. Generate a key per GitHub identity:
ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519_personal -C "you@personal.com"
ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519_work -C "you@work.com"

2. Create ~/.ssh/config:
Host github-personal
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_ed25519_personal

Host github-work
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_ed25519_work

3. Update git remotes:
git remote set-url origin git@github-personal:username/repo.git
git remote set-url origin git@github-work:org/repo.git

This isolates each GitHub account using a key alias, so you avoid auth conflicts.
    

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