Handbooks for for development / software engineering practices, for new employees, how to do things etc.
Valve Handbook for new employess
https://remak_team.gitlab.io/team_website/
https://github.com/guettli/programming-guidelines
https://github.com/SalGnt/cscs – A curated list of Coding Style Conventions and Standards
https://about.gitlab.com/handbook/people-group/general-onboarding/
PEP 8 – Style Guide for Python Code
http://docs.python-guide.org/en/latest/writing/style/
https://github.com/unicodeveloper/awesome-nextjs
https://github.com/chentsulin/awesome-graphql
https://github.com/josephmisiti/awesome-machine-learning
https://github.com/MaximAbramchuck/awesome-interview-questions