Core77 (https://www.core77.com) is by far the most nuts-and-bolts industrial design blog, though still not enough process articles for my taste.

https://www.dezeen.com

https://www.designboom.com/

https://design-milk.com

And Pinterest is great for inspiration.

Product designers are mostly on Instagram and YouTube unfortunately. It's rare for people to write like me. But /r/IndustrialDesign(er) and /r/Design are good places for written communication.