Connect4Prog is a free library of practical programming tutorials, project guides and interview questions, written to help you go from “I read about it” to “I built it”.
What you’ll find here
- Python: from the basics to ready-to-build projects with source code, web scraping, automation and data work.
- SQL: queries, joins, practice questions and database fundamentals.
- Java and JavaScript: core language features, OOP and the questions interviewers ask.
- Interview preparation: question-and-answer guides for programming and technical interviews.
- Cheat sheets and notes: short references you can keep open while you code.
How we write
Every article is built around code you can run. We explain the idea in plain English, show a working example and point out the mistakes beginners usually make. When a topic changes, we update the article instead of leaving an outdated copy online.
Who we are
Connect4Prog is part of the Connect4Techs network of free learning sites, alongside Connect4Techs IT for IT certification resources. The network is run by a small team of developers and IT engineers who believe good learning material should be free and easy to find.
The site is supported by advertising, which keeps every article free to read. We keep ads out of the way of the content as much as we can.
Have a topic you want covered?
Tell us what you’re learning and we’ll consider it for a future tutorial.