Reddit mentions of Python Scripting for ArcGIS

For QGIS I would suggest: https://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/

If you are into arcpy, "Python scripting for arcgis" is a fantastic book to get you up and running:
https://www.amazon.com/Python-Scripting-ArcGIS-Paul-Zandbergen/dp/1589483715

https://www.amazon.com/Python-Scripting-ArcGIS-Paul-Zandbergen/dp/1589483715/ref=sr_1_1?ie=UTF8&qid=1498483938&sr=8-1&keywords=gis+python

100% recommend this to get a grip on what python does in GIS

I'm unsure if posting a link is appropriate on this sub but I have found the linked book, "Python Scripting for ArcGIS," to be a really great source for beginners (such as myself).
https://www.amazon.com/gp/aw/d/1589483715/ref=mp_s_a_1_1?ie=UTF8&qid=1520648132&sr=8-1&pi=AC_SX236_SY340_FMwebp_QL65&keywords=python+scripting+for+arcgis&dpPl=1&dpID=41Ghg1tE14L&ref=plSrch

Python Scripting for ArcGIS by Paul A. Zandbergen is a text published by ESRI, it is a few years old now and does not make use of Python 3 but its a good start.

Amazon. Perhaps they mean this book

I used this...

https://www.amazon.com/Python-Scripting-ArcGIS-Paul-Zandbergen/dp/1589483715

I've never been to one of these live courses, but I doubt they are any more valuable then just looking at free videos online and reading books. The main advantages to books/videos is you can go at your own pace, they are packed full of more information than can possible be conveyed/received in a short live course, and they are going to be MUCH cheaper.

A couple of good books to check out:

For learning to interact with ArcGIS software: https://www.amazon.com/Getting-Know-ArcGIS-Michael-Law-ebook/dp/B01DK3SWO4/ref=mt_kindle?_encoding=UTF8&me=&dpID=41J4z6t5nqL&preST=_SX342_QL70_&dpSrc=detail

GIS Basics: https://www.amazon.com/GIS-Fundamentals-Geographic-Information-Systems/dp/1506695876/ref=pd_sbs_14_4?_encoding=UTF8&pd_rd_i=1506695876&pd_rd_r=WM4VTBZR7PNZM326YA47&pd_rd_w=3jJcZ&pd_rd_wg=8MKvp&psc=1&refRID=WM4VTBZR7PNZM326YA47&dpID=51oUfZ5VUCL&preST=_SY291_BO1,204,203,200_QL40_&dpSrc=detail

For ArcPy/Python: https://www.amazon.com/Python-Scripting-ArcGIS-Paul-Zandbergen/dp/1589483715/ref=sr_1_1?s=books&ie=UTF8&qid=1517942628&sr=1-1&keywords=python+for+arcgis

There are also plenty of free resources to learn to use QGIS: http://www.qgistutorials.com/en/

The important thing to focus on from any of these sources though, is to learn the concepts, not the processes. The GIS concepts are the same across different softwares, platforms, programming languages, etc.