I recommend you use the Anaconda with Python 3.6. To avoid conflicts, first, remove any other Python distributions you already installed.
You can take a look at the following video tutorials:
General Introduction from Lynda (here you can see how to use Lynda.com for free)
Anaconda on Mac: Jupyter Notebook Tutorial: Introduction, Setup, and Walkthrough (30 minutes)
Note: If you are installing on Windows, during your installation it asks you if it should be added to your PATH. I highly recommend you add it to the PATH as you can see both of the following boxes should be checked in installation:
If you already installed it and forgot to add it to your path, look at the following video to see how you can add Anaconda to the PATH after installation:
Anaconda on Windows 10: How to set PATH for Anaconda to run Jupyter Notebook from the command line (8 minutes)
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