Best method to authenticate across multiple apps

Hi,
I am trying to figure out the best way to authenticate across multiple apps. I am a bit confused about the SSO, and OIDC server, though it seems like that may be the way to go. I also thought of using ElysiaJS to create just a better-auth server, then updating BETTER_AUTH_URL to be the same across all my apps. Im a bit stuck, any help would be appreciated!
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