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Learning Resources

General

• Khanacademy
• Khanacademy - What are Course and Unit Mastery?
• Wikipedia
• MIT OpenCourseWare
• Fiddle Sites
  • SQLfiddle
  • JSfiddle
  • CodePen

Challenge Sites

• projecteuler
• codefights
• codewars
• CodeChef
• topcoder
• coderbyte.com
• hackerrank.com
• leetcode.com
• spoj.com
• codingame.com

Learn Security

• hackthebox
• root-me.org
• picoctf.com
• ctftime.org

Learn Java Backend

• mvnrepository
  
  • Apache Pdf Box
  • Scribe Java (Oauth)
  • JSweet (Frontend in Java)
  • J2HTML (HTML Templating)
  • JOOQ (Typesafe SQL)
• Caffeine Cache
• Send Email with Java
• Create PDF files with java
• Java Make QR Code Image
• Spark Backend Framework
• Java Collections Time Complexity Cheatsheet

Learn Frontend

• w3schools
• Bootstrap
  • Bootstrap Documentation
  • Bootstrap Examples
  • Bootstrap Icons

Learn SysAdmin

• GitLab
• digitalocean
• Netlify
• DigitalOcean SysAdmin Guide
• NGINX

Learn Databases

• mysqltutorial.org