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.
C++ 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 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 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.