Newbie questions

• C++: Datatypes, which to use and when?
• C++ new & delete and functions
• Which method to use to check if array key exists in std::map? [duplicate]
• Should i always use GL_ARGB format for all textures in OpenGL?
• OpenGL: How much memory anisotropic filtered textures will use?
• C++ How to replace a function but still use the original function in it?
• How to set a value in windows registry? (C++)
• glReadPixels() really slow, better solution to get OpenGL coordinates from mouse position?
• OpenGL: How to get GPU usage percent?
• C++ new & delete and string & functions

Newbie answers