Little adjustments to getting_started/readme

getting_started/README.md

 Getting started
 ===============
 
-This directory contains the "Getting started" practical.
+
+This directory contains the _Getting started_ practical, intended for those of
+you who are new to Python as a language, or want a refresher on how it all
+works.
+
+
+If you are already comfortable with Python, `numpy`, `nibabel`, and `jupyter`,
+then you might want to check out the `advanced_topics` folder.
+
 
 1. Python basics (MJ)
 2. Text input/output (MC)
@@ -9,5 +17,5 @@ This directory contains the "Getting started" practical.
 4. Numpy (PM)
 5. Nifti images (MJ)
 6. Image manipulation (MC)
-7. Jupyter notebook and Ipython(MC)
+7. Jupyter notebook and IPython (MC)
 8. Writing a callable script (MJ)