Table of Contents Tips AWS Browser perfomance Git Chrome Dev Tools Command line / Terminal JavaScript TypeScript React Node.js Docker NPM Testing CSS Other Security Challenges Implementation in Javascript Unscramble words Remove dublicates from array Batches Sort best scores Find first dublicate First not repeating character Rotate image Maskify credit card Number to ordinal Revers polish notation Run Length Encoding (RLE) Implementation in Python Romeo Algorithms Sort Merge Sort Left Rotation Brute Force Greedy