Where can I find all the functions provided in kernel32.dll? I was able to find some functions here, but I don't know how authentic that site is. Is there an authentic site that lists out all the available functions with proper documentation. I searched online but couldn't find any.
Why do you specifically want to know about the functions in kernel32.dll? For legacy reasons that dll is still the entry point for a lot of windows api functionality, but the windows API is now far FAR larger than the 3 subsystems Windows 3.x offered (kernel, user and gdi).
The System Services section in MSDN covers the APIs exported from kernel32.dll, and many more.
As MSDN no longer documents just the Kernel32 exports in a single list, you could use DumpBin to extract a list of all the exports... and then search for the function on MSDN.