Mini software or project in c++

i want to work on software or project in c++
then what technology i will should be learn

That depends on the type of project you want to work on.
If you want to work on game development then you can learn unreal game engine, that use c++ as the language for development. If you are interested in operating systems and compiler design then also you can use C++ for their implementation. Also, you can implement simple game like 2048 in pure C++ without using any 3rd party library/framework.
A lot things can be done, it all comes down to your interest.

Hope this helps.

how can i connect oracle database to codeblock editor

For that, I would like you to go through this link :