The number under usage represents the number of blocks on the disk surface. The number under files represents the number of files or directory names. 1000 blocks is roughly equivalent to 1 megabyte. It is divided into 6 areas. While each directory's contents are confidential to each user, excessive files or data stored in your home directory can adversly affect the performance of the system for others as well as for yourself.
All users directories in that partition are affected.
Below is an example of what your quota may look like. The numbers under quota and limit are based on what all Grits users are given upon account creation. The number under usage represents the number of blocks on the disk surface. The number under files represents the number of files or directory names. 1000 blocks is roughly equivalent to 1 megabyte.