A comprehensive collection of Capture The Flag (CTF) competition writeups spanning multiple years and events. The collection includes detailed solutions and explanations for various CTF challenges from competitions such as picoCTF 2018, GLUG 2018, TUCTF 2018, OtterCTF 2018, xiomara 2019, BsidesSF 2019, Securinets prequal 2019, INShAck-2019, and ISITDTU-2019. The repository contains writeups for over 130 challenges across different CTF events, providing insights into problem-solving approaches and techniques used in cybersecurity competitions. Additionally, it includes writeups for HackTheBox challenges, offering practical examples of penetration testing and vulnerability exploitation scenarios. The writeups are organized by competition and year, making it easy to navigate through different events and challenge types. Each writeup typically includes the challenge description, solution methodology, and step-by-step explanations of the approach taken to solve the problem.