Core CS Study Notes
Operating systems, networks, DBMS, and computer science foundations.
FreeOperating Systems Study Note PDF
A beginner-friendly Operating Systems PDF guide covering processes, threads, memory management, synchronization, CPU scheduling, and deadlocks. This guide explains how operating systems manage running programs, CPU execution, memory allocation, concurrency, race conditions, and deadlock prevention. It is designed for students and developers who want a strong computer science foundation without getting lost in overly academic explanations. Topics Covered 1. Processes - Process lifecycle, process states, PCB, context switching, scheduling, and real examples. 2. Threads - Threads vs processes, multithreading, shared memory, and concurrency trade-offs. 3. CPU Scheduling - FCFS, SJF, Round Robin, priority scheduling, throughput, waiting time, and response time. 4. Synchronization - Race conditions, critical sections, mutexes, semaphores, locks, and producer-consumer. 5. Memory Management - Stack, heap, virtual memory, paging, segmentation, page faults, and memory leaks. 6. Deadlocks - Deadlock conditions, prevention, avoidance, detection, recovery, and examples. What You Will Get 10-page detailed PDF guide Beginner-friendly OS explanations Process and thread comparison tables Memory notes and synchronization examples Deadlock interview answers and revision cheat sheet Best For Computer science students, software engineering students, backend developers, interview aspirants, developers learning concurrency, and anyone revising OS fundamentals.
FreeComputer Networks Study Note PDF
A beginner-friendly Computer Networks PDF guide covering TCP/IP, HTTP, DNS, TLS, and load balancing. This guide explains the full flow of opening a website, how clients connect to servers, how DNS resolves domains, how HTTPS secures traffic, and how load balancers distribute requests. It is designed for developers who want practical networking knowledge for backend, DevOps, system design, and web interviews. Topics Covered 1. Website Request Flow - DNS lookup, TCP connection, TLS handshake, HTTP request, server response, and rendering. 2. TCP/IP Basics - IP addresses, ports, sockets, packets, routers, NAT, and CIDR. 3. TCP vs UDP - Reliability, ordering, overhead, use cases, and interview comparisons. 4. HTTP - Methods, status codes, headers, cookies, caching, and request/response structure. 5. DNS - Recursive resolvers, authoritative servers, records, TTL, and domain resolution. 6. TLS And HTTPS - Certificates, encryption, handshakes, and secure communication basics. 7. Load Balancing - Algorithms, health checks, reverse proxies, sticky sessions, and scaling. What You Will Get 10-page detailed PDF guide Networking concepts in simple language Real-world web request flow Protocol comparison tables Commands, examples, interview Q&A, and cheat sheet Best For Software engineering students, backend developers, full-stack developers, DevOps beginners, system design interview aspirants, and anyone learning web networking basics.