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 7 Ways to Practice SQL Online  Practice SQL Online 1. SQL Fiddle SQL FIDDLE  is a great place to start if you’re looking to, well, fiddle around with SQL. A free site that  allows you to test and save queries  in several different kinds of SQL, SQL Fiddle is a perfect way to play around with the queries you have learned to date. Better still, you can easily link to your query samples, allowing others to comment and help with any bumps on the road. If you browse SQL community pages long enough, you’ll see plenty of people linking to SQL Fiddle; it’s a great way to enlist others to help you if you have a problem. 2. SQLZOO You’ll find it easy to get going in SQL at  SQLZOO . This is a free platform that presents SQL in a way that is very friendly to beginners. It’s super intuitive to use and  chock-full of tests and tutorials  that will help you get hands-on with SQL in a comfortable environment. It offers practice queries and interactive SQL engin...

 Linux online terminals to practice commands from the browser Linux online terminals 1-  Jslinux 2-  Webminal 3-  Tutorialspoint Unix Terminal 4-  JS / UIX  

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 Basic Concepts of OOP (Object-Oriented Programming)  What Is an Object in Programming? Object-oriented programming, or OOP, is an approach to problem-solving  where all computations are carried out using objects.  An object is a component of a program that knows how to perform certain actions and how  to interact with other elements of the program.  Objects are the basic units of object-oriented programming. A simple example of an object would be a person.  Logically, you would expect a person to have a name.  This would be considered the property of the person.  You could also expect a person to be able to do something, such as walking or driving.   This would be considered a method of the person. Basic Concepts: Class  - The class is a model or blueprint or prototype of an object that defines or specifies all the properties & behavior of the objects.  object  - An object is an entity or instance of a class.  - ...

Learn Data Structures And Algorithms 1- educative 2- geeksforgeeks 3- tutorialspoint

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 Khan Academy Courses 1 -  Computer programming 2  - Computer science 3-  Computer networks 4-  Intro to SQL: Querying and managing data