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A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.

For more about AWS and AWS Certifications and updates to this Gist you should follow me @leonardofed

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# NPM
watchman watch-del-all && rm -rf $TMPDIR/react-* && rm -rf node_modules/ && npm cache clean --force && npm install && npm start -- --reset-cache


# YARN
watchman watch-del-all && rm -rf $TMPDIR/react-* && rm -rf node_modules/ && npm cache clean --force && yarn install && npm start -- --reset-cache

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tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

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// Add the following lines into your ~/.gitconfig

[user]
    name =
    useConfigOnly = true
    email =

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class Solution {
    func romanToInt(_ s: String) -> Int {
        var iterator = s.utf8CString.makeIterator()

        var result: Int = 0
        
        var current: RomanCharacter?
        current = iterator.getNext()
        
        while let unwrappedCurrent = current {

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class Solution {
    func isSubsequence(_ s: String, _ t: String) -> Bool {
        let sub = Array(s.utf8)
        let string = Array(t.utf8)
        
        var subIndex: Int = 0
        var stringIndex: Int = 0
        
        while stringIndex < string.count, subIndex < sub.count {
            if string[stringIndex] == sub[subIndex] {

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class Solution {
    func updateBoard(_ board: [[Character]], _ click: [Int]) -> [[Character]] {
        let h = board.count
        let w = board[0].count
        
        var copied = board

        func checkAdjacentPoints(x: Int, y: Int) {
            var numberOfBombs = 0
            

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let path = UIBezierPath()
path.move(to: startPoint)
let endPoint = CGPoint(x: posX + CGFloat.random(in: ), y: 0)
let controlPoint1 = CGPoint(x: , y: )
let controlPoint2 = CGPoint(x: , y: )
path.addCurve(to: endPoint, controlPoint1: controlPoint1, controlPoint2: controlPoint2)

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let animation = CAKeyframeAnimation(keyPath: #keyPath(CALayer.position))
animation.path = path.cgPath

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let animation = CABasicAnimation(keyPath: #keyPath(CALayer.transform))
let angle = CGFloat.random(in: ) * CGFloat.pi
let rotation = CATransform3DMakeRotation(angle, 0, 1, 0)
let finalScale = CGFloat.random(in: 2…5)
let transoform = CATransform3DScale(rotation, finalScale, finalScale, 1)
animation.toValue = transoform