Regarding for confidence and old topics

Respected sir for new technologies like android or jquery mobile i would like to see some projects with explanation.For older topics if new or old members try to post topics wich exist like gridview,basics of ado.net ,3 tier architecte,these topics already exist in net in many websites wich is a waste of time,if you have 1 or 2 websites about gridview it is ok.But we have many websites about basics of gridview.Instead they can write different topics or something different about gridview.There are some topics wich are repeated in this site but content is not same ,the authors have written in there own style but we can teach world some thing new