Learn this super English phrase - ’Scratch the surface’. What does it mean?

What does the English phrase ’only scratched the surface’ mean? Another super English phrase that refers to only having a small amount of information about something. You have only scratched the surface. There is more to discover. #learnenglish #duncanenglish Here is the playlist for my short lessons - list=PLbvnlSJNf_DZQy48_75zaAnH790_HJGZ3 Misterduncan’s PLAYLISTS ... Full English - Lessons 1 to 91- Donate - English Topic - WORD STOP - May days - Dunctober - December drop in - =PLbvnlSJNf_DY7bb_xeLDzKPEJLzN4Z3io Xmas lessons - LIVE STREAMS - My life in China and England - Other English lessons -