Operating Systems is the course every CSE/IT syllabus shares and every product interview still asks about. This course covers the full university core in eight compact lessons: process models and PCBs, FCFS through Round Robin with Gantt-chart arithmetic, critical sections with mutexes and semaphores, the classic producer-consumer and deadlock conditions, paging with TLB math, page replacement including Belady and thrashing, file inodes and allocation, and disk scheduling with RAID.

Every lesson uses the nine-block structure (objectives, hook, concept, worked example, practice, common mistakes, exam angle, graded quiz, summary). A 30-question bank feeds a 15-question timed final. Passing earns a verifiable TieEdu certificate.

**Who this is for:** second- and third-year CSE/IT students preparing for university exams, GATE fundamentals, and placement interviews that ask OS questions.

**What you need:** pen and paper for Gantt charts and fault counts; a browser for the quizzes.

Processes, scheduling, concurrency, deadlock, memory, paging, virtual memory and file systems — exam + interview core

Operating Systems

Most courses teach you C syntax and stop. This one teaches you the *machine*: what a compiler actually does, how memory is laid out, why pointers behave the way they do, and how to reason about a program that has no garbage collector and no safety net.

Fifteen modules take you from writing and compiling your first program through types, control flow, functions, arrays, pointers, dynamic memory, structs, files, the preprocessor, and the standard library — then close with two capstones (a reusable dynamic string and string map, and a recursively destroyed binary search tree) and a cumulative final assessment.

Every lesson is short, runs real compilable C, and is paired with interactive visualisations: watch the stack and heap change step by step, trace a program line by line, see bytes and bit-fields laid out, and follow arguments across a function call. There is no sign-up wall and no paid tier — finish the modules, pass the quizzes, and you earn a verifiable TieEdu certificate plus XP on the leaderboard.

**Who this is for:** students who have finished Coding Foundations or written a little code in any language, and anyone preparing for placements who needs to be able to read and write C with confidence.

**What you need:** a terminal and a C compiler (gcc or clang). Module 1 walks you through installing one in about five minutes.

A free, deep, hands-on C course — the language underneath almost everything else

C Programming: From First Program to Pointers and Data Structures

DBMS is one of the highest-weight subjects in every CSE university paper and a favourite of placement interviewers. This course covers the full core in eight compact lessons: ER diagrams and their relational mapping, keys and relational algebra including division, SQL core with joins and aggregation, subqueries/views/indexes, functional dependencies with attribute closure, normalization from 1NF through BCNF with lossless-join checks, transactions with ACID and serializability, and concurrency control with 2PL plus write-ahead-logging recovery.

Every lesson uses the nine-block structure (objectives, hook, concept, worked example, practice, common mistakes, exam angle, graded quiz, summary). A 30-question bank feeds a 15-question timed final. Passing earns a verifiable TieEdu certificate.

**Who this is for:** second- and third-year CSE/IT students preparing for university exams, GATE fundamentals, and placement interviews that ask database questions.

**What you need:** pen and paper for closures, normal forms and precedence graphs; a browser for the quizzes.

ER models, SQL, normalization, transactions, concurrency control and crash recovery — exam + interview core

DBMS

Computer Networks is the CSE subject that shows up in university exams, GATE and every infrastructure or backend interview. This course covers the full core in eight compact lessons: layered models and encapsulation, MAC/IP/port addressing with ARP, framing and CRC, switches and routers, IPv4 subnetting arithmetic, distance-vector vs link-state routing, the TCP handshake with flow and congestion control, DNS/HTTP/DHCP, TLS with firewalls, and wireless/SDN/CDN for modern context.

Every lesson uses the nine-block structure (objectives, hook, concept, worked example, practice, common mistakes, exam angle, graded quiz, summary). A 30-question bank feeds a 15-question timed final. Passing earns a verifiable TieEdu certificate.

**Who this is for:** second- and third-year CSE/IT students preparing for university exams, GATE fundamentals, and placement interviews that ask networking questions.

**What you need:** pen and paper for subnetting and handshake diagrams; a browser for the quizzes.

Courses

Operating Systems

C Programming: From First Program to Pointers and Data Structures

DBMS

Computer Networks