Which is the best website to learn about sheet metal design guidelines?

 

I know this is old but I'd love to know this too. Specifically things like general guidelines for how close to bends you can add holes and other features, and also minimum tab lengths for bends.

 

You mean apart from engineeringclicks? https://www.engineeringclicks.com/?s=sheet+metal

 

Hah, you got me! Thanks for showing me this. I guess I need to be less lazy!