where the community are storing and sharing tons of examples for starters?

from my experience when trying to start learning a language, framework or engine, is having tons of examples to start from, and then start to create our own stuff

so, where from can we find them, and how can we help contributing with such examples?

Scattered all over.

started putting all my pixel shader links here for reference links to the reimers tutorials are here good place to start if your new.

Tons of people and a lot who visit the forums hang out on the discord server

here too: https://github.com/SimonDarksideJ/XNAGameStudio/tree/archive/Samples