CG Wiki: https://www.tokeru.com/cgwiki/?title=Houdini
Houdini Gubbins: https://houdinigubbins.wordpress.com/
John Kunz Wiki: https://wiki.johnkunz.com/index.php?title=Main_Page
lex.ikoon: https://lex.ikoon.cz/
Render Everything: https://www.rendereverything.com/blog
Toadstorm Nerdblog: https://www.toadstorm.com/blog/?cat=30
Juraj Tomori: https://jtomori.github.io/vex_tutorial/