---
title: "Discussion on \"Learn API Fundamentals and Architecture – A Beginner-Friendly Guide\" | Hashnode"
description: "Discussion on \"Learn API Fundamentals and Architecture – A Beginner-Friendly Guide\". Here are some questions for you: How do you log in to apps with your Google, Apple, or Microsoft account? How do online payments with Paystack or PayPal work? How do apps like Facebook and Instagram share information and notifications?\nThe answer is:..."
url: "https://hashnode.com/posts/learn-api-fundamentals-and-architecture/67dd93c136028f6326576025"
---

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Discussion

# [Learn API Fundamentals and Architecture – A Beginner-Friendly Guide](https://freecodecamp.org/news/learn-api-fundamentals-and-architecture?utm_source=hashnode&utm_medium=feed)

Here are some questions for you: How do you log in to apps with your Google, Apple, or Microsoft account? How do online payments with Paystack or PayPal work? How do apps like Facebook and Instagram share information and notifications? The answer is:...

Mar 21, 2025 · 18 min read · freecodecamp.org  
Updated Jul 9, 2025  
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-   [#apis](https://hashnode.com/tag/apis)
-   [#architecture](https://hashnode.com/tag/architecture)
-   [#web-development](https://hashnode.com/tag/web-development)

## Written by

[Ikegah Oliver](https://hashnode.com/@Oliverkrane)

@Oliverkrane · Port Harcourt, Nigeria

  
[View profile](https://hashnode.com/@Oliverkrane)

Software developer, NodeJS enthusiast and writer

I am a backend developer with a year of experience in building and maintaining scalable and performant web applications. I am proficient in a variety of technologies, including Node.js, Express.js, MongoDB, and AWS. I am also a strong problem solver and have a keen eye for detail.

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