Windows API in C/C++

Help, I have no idea how to correctly use the API to create windows and fill them with text and shit.

Give me information, tutorials, etc.

It's not really that hard;

wm title . "C++ WinAPI hello world app"
label .hwlabel -text "Behold, a button:"
button .hwbutton -text "Click me" -command {
    tk_messageBox -title "Hi" -message "Hello, world!"
}
pack .hwlabel .hwbutton