The missing step is written down
Most tutorials jump from "here is a variable" to "now implement a linked list" in two paragraphs. Here, the step in between is spelled out — because that's the step people actually get stuck on.
// About
Computer science, taught the way
it should have been the first time
CS Learning Portal is a free place to learn computer science properly — tutorials that explain the why, a built-in editor so you can run every example as you read, and practice that tells you when you've actually got it. No paywall, no account needed to read.
// Why this exists
The tutorial that skipped a step
Every self-taught programmer has the same story. A tutorial moves from "here is a variable" to "now implement a linked list" across two paragraphs, and somewhere in that jump the ground disappears. You reread it four times, assume the problem is you, and close the tab.
It usually isn't you. It's that the person writing had forgotten what it was like not to know. The missing step was obvious to them, so it never got written down — and that one gap is where most people quit.
This site exists to write those missing steps down: ordered correctly, tested end to end, and honest about which parts are genuinely hard. It stays free, because a paywall between someone and a working knowledge of computer science is a bad trade for everyone.
In practice that means four things you can use today — structured tutorials that build one concept at a time, an online code editor for running every example without installing anything, coding problems graded against real test cases, and interview preparation for when you're ready to be asked about it out loud.
// What sets it apart
Four things that don't get compromised
You run the code, not just read it
Every lesson sits next to a real editor. Change the example, break it, see the error. Reading code teaches you to recognise it; running it teaches you to write it.
Written by one engineer, not a content farm
No outsourced filler, no AI-spun padding to hit a word count. Each chapter is drafted, run, and corrected by someone who has shipped this stuff for a living.
Free, with no strings
No paywall, no account needed to read, no ad network watching you learn. Sign in only if you want your progress saved.
The library today
read live, never a rounded-up number- tutorials
- 5
- courses
- chapters
- 138
- lessons
- articles
- 10
- written
- questions
- 20
- practice
// Who builds this
Meet the founder
Md Imran Ansari
Founder · Software Engineer · Freelancer · India
I'm a software engineer from India with 8 years of experience building production software, and I write everything you read here. I hit the missing-step wall often enough while learning, then watched juniors on my own teams hit exactly the same one — so I started writing the explanations I wish someone had given me.
- Name
- Md Imran Ansari
- Role
- Software Engineer · Freelancer · Founder, CS Learning Portal
- Experience
- 8 years building production software
- Qualification
- B.Tech in Computer Science Engineering
- Based in
- India
// Common questions
Frequently asked questions
What is CS Learning Portal?
CS Learning Portal is a free computer science learning platform. It combines step-by-step tutorials, an online code editor you can run examples in, coding problems with automatic judging, practice quizzes, and interview preparation material — all in one place.
Who runs CS Learning Portal?
It is built and written by Md Imran Ansari, a software engineer and freelancer from India with 8 years of experience in production software and a B.Tech in Computer Science Engineering.
Is CS Learning Portal free to use?
Yes. Every tutorial, article and practice question is free to read and run. There is no paywall and no account is required to read — you only sign in if you want your progress saved.
Do I need to install anything to run the code?
No. The code editor runs in your browser against a sandboxed runner, so you can edit and execute the examples in any lesson without installing a compiler or setting up a local environment.
How do I report a mistake or request a topic?
Email cslearningportal.edu@gmail.com with the page URL and what you expected. Corrections are usually shipped within a week, and repeated topic requests get prioritised.
Can I hire Md Imran Ansari for freelance work?
Yes. He takes on freelance web and software development projects through Fiverr, and can also be reached directly by email.
// Get in touch
Questions, corrections, ideas
Found a wrong output, a broken example, or a chapter that loses you halfway? Want a topic covered? Write to me directly — every message reaches the same inbox, and corrections usually ship within a week.
Email for any queriescslearningportal.edu@gmail.com