@ liudr , i was thinking another addition, I think there must be or can be a Beginner's list of getting them started in each case that the starting people take up like:
getting started with motor's?--> Yes--> OK then get these ingredients! in your lab
getting started with LED's/DC lighting --> Yes--> OK then get all this stuff
getting started with External Programmer--> Yes --> OK start learning this way.
getting started with Wireless(Bluetooth)--> Yes--> OK get these ingredients.
getting started with Wireless(RF)--> Yes --> OK get these ingredients.
in addition to "get these ingredients" we can also add-up some guidelines and anyother additional stuff that we think might provide an Helping hand and lower the forum cluttering with redundancy.
also, i think these days some experts are fed up of answering the very often/very monotonous/very repetitive same questions of the ever entering newbies into forum and their(newbies) not clarifying with the basics which are already available if a bit search is done saving their and other people's time.