All tutorials are found on the GNU radio wiki  [here](https://wiki.gnuradio.org/index.php?title=Tutorials).  Ones of interest to me are: 

- [Your First FlowGraph ](https://wiki.gnuradio.org/index.php?title=Your_First_Flowgraph)
- [Python Block with Vectors](https://wiki.gnuradio.org/index.php?title=Python_Block_with_Vectors)
- [Using GNURadio with SDR](https://wiki.gnuradio.org/index.php?title=Guided_Tutorial_Hardware_Considerations)
- IQ & Complex Signals 
- [VOLK: What it is & Why it Rocks](https://wiki.gnuradio.org/index.php?title=VOLK_Guide)