Android

• Androidhive - Really helpful blog for Android developers.
• Mindorks - All About Android App Development.
• Android Instagram Clone - A step-by-step guide to build your own Android Instagram Clone (Email Authentication, Database, Cloud-Storage)
• AndroidPub - The Pub(lication) for Android & Tech, focused on Development
• Kotlin Academy - Site with mission to simplify Kotlin learning

CSS

Blog

• CSS Tricks - Over the years, CSS-Tricks has come to become a site about all things web design and development.

Courses

• Flexbox CSS - A simple, free 20 video course that will help you master CSS Flexbox!
• Grid CSS - From fundamentals to real world in about 4 hours.

Deep Learning

Courses

• Deep Learning Andrew Ng - A course from top expert of AI - Andrew Ng
• Deep Learning A-Z - A bestseller Deep Learning course on Udemy. Learn to create Deep Learning Algorithms in Python.
• Tensorflow for Deep Learning Research - Stanford University: Tensorflow for Deep Learning Research
• Deep Learning for Natural Language Processing - Stanford University: Deep Learning for Natural Language Processing

Git

Courses

• Pro Git - The entire Pro Git book, written by Scott Chacon and Ben Straub and published by Apress

Javascript

Courses

• egghead.io
• Javascript30 - Build 30 things in 30 days with 30 tutorials - No frameworks x No Compilers x No libraries x No boilerplate
• jQuery Tutorial from W3School - jQuery greatly simplifies JavaScript programming.
• JavaScript Tutorial from W3School - This tutorial will teach you JavaScript from basic to advanced.
• Exploring ES6 - Upgrade to the next version of Javascript

Machine Learning

Courses

• Machine Learning Mastery - Learn a lots trick from there. Good blog for Machine Learning
• Machine Learning Andrew Ng - A course from top expert of AI - Andrew Ng
• Machine Learning A-Z - A bestseller Machine Learning course on Udemy.
• Towards Data Science - Sharing concepts, ideas and codes about Data Science.

ReactJs

Courses

• Awesome React - A collection of awesome things regarding React ecosystem.
• React Training - Learn From React Community Leaders
• React Hooks - Getting Started with React Hooks
• Redux - Getting Started with Redux.

ReactNative

Courses

• Awesome React Native - Awesome React Native components, news, tools, and learning material!

Ruby On Rails

Courses

• Sello - Blog about rails.
• Ruby On Rails - Tutorials and opinions about development in Ruby on Rails. I found a lots great articles in there.
• Devwalks Blog - Found a lots awesome stuff in there. For example like building Instagram by Rails
• Rails 5 Tutorail - One of the most popular resources for Rails developers (Free)
• RailsCasts - Learn a lots of trick, useful things from there.(Free)
• Let's Build Instagram With Ruby on Rails - Let's build an Instagram clone with Ruby on Rails!
• Ruby on Rails Guides - These guides are designed to make you immediately productive with Rails..

Vuejs

Blog

• A Killer Vue.js Blog Demo: Launch in 2 Hours Tops
• Vuejs Developers - Vue.js Developers' mission is to up your skill and knowledge of Vue.js and related tools, beyond what's in the official documentation.
• Made with Vue - A collection of projects made with vue.js
• Alligator - Not just about Vue. This blog is all about front-end.