resources for server side auth

I’m struggling to find tutorials or courses that hold your hand and walk you through basics on how to make a request and authenticate/authorize a user- even platform and language specific courses are difficult to find. Preferably using google cloud console with oauth2.0 or service worker in a perfect world

Getting more comfortable with the concepts but examples on the actual syntax and steps to do so is what I’m looking for then how to work with the token/refresh token would be a nice follow up. I’m so dense when it comes to backend as a whole , any suggestions or ideas for resources are greatly appreciated ✨
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