Parallax propeller microcontrollers are a bit different that we are used to. They are build using different concept of embedded electronics. Propellers are multicore microcontroller that can run tasks parallel.
Parallax Propeller can be programmed using GCC C language what makes easy transition to this pretty exotic MCU. If you are new to C and especially yo Propeller microcontrollers then there is a C tutorial available to get started with simple programs. SimpleIDE makes things even easier to build and upload your first program. If you are more advanced embedded developer, then you probably will miss some libraries that are already quite polished in Spin or Propeller PASM languages.