Add System Design Fundamental article links

README.md

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 # awesome-system-design-articles
 This repository contains System Design articles which are useful during the interview preparation and while learning Distributed Systems
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+## System Design Fundamentals
+
+- [Content Delivery Network (CDN)](https://www.cloudflare.com/learning/cdn/what-is-a-cdn/)
+- [Caching](https://medium.com/must-know-computer-science/system-design-caching-acbd1b02ca01)
+- [Latency vs Throughput](https://aws.amazon.com/compare/the-difference-between-throughput-and-latency/)
+- [CAP Theorem](https://www.bmc.com/blogs/cap-theorem/)
+- [Load Balancing](https://aws.amazon.com/what-is/load-balancing/)
+- [ACID Transactions](https://redis.com/glossary/acid-transactions/)
+- [SQL vs NoSQL](https://www.integrate.io/blog/the-sql-vs-nosql-difference/)
+- [Consistent Hashing](https://arpitbhayani.me/blogs/consistent-hashing/)
+- [Database Index](https://www.progress.com/tutorials/odbc/using-indexes)
+- [Rate Limiting](https://www.imperva.com/learn/application-security/rate-limiting/)
+- [Microservices Architecture](https://medium.com/hashmapinc/the-what-why-and-how-of-a-microservices-architecture-4179579423a9)
+- [Strong vs Eventual Consistency](https://hackernoon.com/eventual-vs-strong-consistency-in-distributed-databases-282fdad37cf7)
+- [REST vs RPC](https://aws.amazon.com/compare/the-difference-between-rpc-and-rest/)
+- [HeartBeat](https://martinfowler.com/articles/patterns-of-distributed-systems/heartbeat.html)
+- [Circuit Breaker](https://medium.com/geekculture/design-patterns-for-microservices-circuit-breaker-pattern-276249ffab33)
+- [Idempotency](https://blog.dreamfactory.com/what-is-idempotency/)
+- [Data Replication](https://redis.com/blog/what-is-data-replication/)
+- [Data Redundancy](https://www.egnyte.com/guides/governance/data-redundancy)
+- [Database Sharding](https://www.mongodb.com/features/database-sharding-explained#)
+- [Proxy Server](https://www.fortinet.com/resources/cyberglossary/proxy-server)
+- [Domain Name System (DNS)](https://www.cloudflare.com/learning/dns/what-is-dns/)
+- [Message Queues](https://medium.com/must-know-computer-science/system-design-message-queues-245612428a22)
+- [API Gateway](https://www.nginx.com/learn/api-gateway/)
+- [Distributed Locking](https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html)
+- [Checksum](https://www.lifewire.com/what-does-checksum-mean-2625825)