Courses
Learn one thing properly,
not ten things halfway.
Structured courses with the theory written out, worked examples, practice and the placement material — in one place, in the order you actually need them.
The later lessons of every course, the full 120-lesson library, the mock test papers and the company-wise series. A pass ends on its own date — nothing auto-renews.
Pointers and Memory in C
The topic that decides whether C makes sense to you or not
Start learningC++ and STL Essentials
For students who know C and need C++ for DSA, labs and contests
Start learningData Structures in C
Build lists, stacks, trees and hash tables yourself, in the language that hides nothing
Start learningAlgorithms and Complexity
Big-O, searching, sorting, recursion, greedy and DP - with the maths actually explained
Start learningDSA Interview Patterns
Six patterns that cover most array and string rounds in campus interviews
Start learningOperating Systems
What the OS is actually doing while your C program runs
Start learningComputer Networks
Follow one web request all the way down the stack and back
Start learningPython for Data Analysis
NumPy, pandas and honest charts, for students who already know basic Python
Start learningMachine Learning Foundations
What learning from data really means, without the hype
Start learningSecure Coding Practices
Write Python that does not hand your database to a stranger
Start learningWhat is free, and what is not
Every tutorial, every practice problem, the compiler, the placement roadmap and the company pages are free and stay free. Courses are a separate, structured thing: the first lessons of each are free to read, and the rest come with a Pro pass.
Those free lessons are not a trailer. Each one finishes what it starts — if you read only those, you should still come away knowing the thing it promised to teach.