I’ve learned BW, Visual Composer, BSP’s, and more all through SCN. Lately I’ve used the free tutorials at sap.com/LearnBI and I have also taken advantage of the information in the Product Roadmap space. If you can’t attend SAP TechEd (aka “SCN Family Reunion” per Mark Yolton ) replays are available too on SCN.
If you are interested in learning more about a product, take Thomas Jung advice and start following that space. I also like the sentiment expressed by Angad Singh which is to “share knowledge to gain knowledge”.
I look forward to seeing your SCN is 10 contribution too.