Register: [ {,:}]

This is the simplest form. Data will be loaded and stored to the specified address.

Register with increment after: [{,:}]!
Use this to update the pointer after loading or storing, ready to load or store the next elements. The increment is equal to the number of bytes read or written by the instruction.

Register with post-index: [{,:}],
After the memory access, the pointer is incremented by the value in register Rm. This is useful when reading or writing groups of elements that are separated by fixed widths, eg. when reading a vertical line of data from an image.