Just a collection of available trainings, conferences, etc.:
ACCU Agile Meets Architecture AWS Skill Builder AWS Training BBV Academy Brilliant CodeKata CodeAcademy CPSA-Advanced Level Cyber Security Training Courses DevQA Digicomp Domestika E-Academy Educative IO Fernstudium FFHS Fernfachhochschule GOTO Berlin Grow IBM Cloud Learn Hub INNOQ Internationale Hochschule JetBrains Academy Kaggle Khan Academy Klubschule Migros Koan-Software Learn to Code Linkedin Learning Linutronix Linux Foundation MicroConsult Microsoft Certifications Microsoft Learning Migro Weiterbildung MIT xPRO Noser Academy oose Open CV Ray Tracing Scrimba Socreatory Socrates Conference Software Code Training Software Quality Lab SwissQ Togaf Zertifizierung Training Zuehlke Academy
Some good technical articles:
Usability Geek Hackernoon Entwickler.de Linux Linuxize SmashingMagazine Serokell UxDesign abdz.do Hackster.io Toptal ByteXD LinuxMagazin Golem Hackaday LinuxGizmo Embedded Software Engineering
Because coding should also make fun and inspire:
AlbaG.Corral ArtBlocks Artists CryptoArt GenerativeHut JunkiYoshi MakeArtWithPython Nannou NatureOfCode SageJenson VeraMolnar
Stuff specifically to C++:
Andreas Fertig Anthony Morast Barry Revzin Best C++ Blogs Websites C++ Best Practices C++ By Example C++ Core Guidelines C++ Reference C++ Stories C++20 Language Examples CopperSpice Fluent C++ Hacking C++ Marius Bancila Meeting C++ Modernes C++ Modern C++ StudioFreya Vishal Chovatiya Vorbrodt
Specifically about clean code: