Backend Deep-Dive · Beginner Friendly ~16 min read · Updated for 2026 · No prior experience required If the words Kubernetes and EKS have always felt like a wall of jargon, this is the guide that finally makes them click. We start from absolute zero — what a container even is — and build up, one idea at a time, until you can follow a single user request all the way through a real Amazon EKS cluster and back. Plain English, simple analogies, and a clear mental model instead of a pile of commands. Prefer to read? Everything in the video is written out below. Skim the table of contents and jump to whatever you need. TL;DR — the whole idea in six lines Containers pack your app and its environment together so it runs the same everywhere. Kubernetes is a manager that runs, heals, scales, and connects hundreds of containers for you. Every cluster has a Control Plane (the brain) and Worke...
Most developers think they understand ArrayList and LinkedList … until an interviewer asks: “When would you use one over the other?” If you can’t confidently answer that — this guide will fix it. Watch Full Video Explanation What is a List in Java? A List is an ordered collection that: Maintains insertion order Allows duplicate elements Supports index-based access List<Integer> list = new ArrayList<>(); ArrayList Deep Dive 1. Internal Working ArrayList is backed by a dynamic array . 2. Contiguous Memory [10] [20] [30] [40] 👉 Enables fast access → O(1) 3. Size vs Capacity Size = 3 Capacity = 5 [10] [20] [30] [_] [_] 4. Resizing Mechanism New array created Capacity increases (~1.5x) Elements copied 👉 Resizing cost = O(n) 5. Performance Operation Time Complexity Access O(1) Insert (end) O(1) amortized Insert (middle) O(n) Delete O(n) ⚠️ Limitation Before: [10, 20, 30...
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