Security

LinksDescriptionsStatus
cybersecurityventuresCyberSecurity News
https://www.first.org/Incident Response Forum
https://www.isecom.orgOpen Methodologies
https://www.isecom.org/OSSTMM.3.pdf[1] OSSTMM
https://owasp.orgOpen web security Project
https://pentestmonkey.net/Penetration Testing resources
https://www.securityforum.org/solutions-and-insights/
https://github.com/CISOfy/lynisSecurity auditing and hardening tool

CTF

Osint

LinksDescriptionsStatus
https://osintframework.com/OSINT Framework
https://github.com/Datalux/OsintgramOsintgram
https://github.com/mikf/gallery-dl
https://inte.comniques.com
https://awesomeopensource.com/projects/osint

Bash & Shell scripting

LinksDescriptionsStatus
https://dwheeler.com/essays/filenames-in-shell.htmlShell scripting good Practises
https://devhints.io/bashQuick bash syntax lookup
https://tldp.org/LDP/Bash-Beginners-Guide/html/Bash-Beginners-Guide.htmlGreat bash guide for beginners

Competitive programming

LinksDescriptionsStatus
https://atcoder.jp/contests/abc273
https://codechef.com/
https://codeforces.com/
https://cses.fi/book/book.pdf
https://cses.fi/problemset/
https://github.com/pllk/cphb
https://medium.com/
https://quora.com/What-is-the-best-strategy-to-improve-my-skills-in-competitive-programming-in-C
https://github.com/lnishan/awesome-competitive-programming
https://github.com/stjepang/snippets
https://cpbook.net/
https://medium.com/big-data-center-of-excellence/ultimate-competitive-programming-setup-for-vscode-with-c-c-and-python-a638126f85ad
https://danlark.org/2020/03/13/how-to-crack-hashcode-competition-with-some-engineering-skills/
https://github.com/kunal-kushwaha/Competitive-Programming-Resources
https://github.com/marioyc/Online-Judge-Solutions
https://github.com/VastoLorde95/Competitive-Programming
https://github.com/kenkoooo/competitive-programming-rs
https://usaco.org/
https://noi.ph/prepare/
https://ekzlib.herokuapp.com/home
https://github.com/jilljenn/tryalgo
https://github.com/Vicfred/kyopro
https://github.com/omonimus1/competitive-programming
https://github.com/abeaumont/competitive-programming
https://github.com/michelbernardods/programming-challenges
https://github.com/manishbisht/Competitive-Programming
https://topcoder.com/community/competitive-programming/tutorials/power-up-c-with-the-standard-template-library-part-1/