What is Anaconda / Jupyter Notebook?

Anaconda:

Anaconda is a free and open-source distribution of the Python and R programming languages for scientific computing, that aims to simplify package management and deployment.

Jupyter Notebook:

Jupyter Notebook is an open-source web application that allows you to create and share documents that contain live code, equations, visualizations and narrative text.

Download & Install Anaconda

Install Jupyter Notebook

I personally like using the command line:

now that we have Anaconda we can run:
conda install -c conda-forge notebook

otherwise, if you use pip you can run:
pip install notebook

Alternatively, you can install Jupyter Notebook by opening the Anaconda-Navigator which should be installed with the Anaconda Cloud you installed above

Open Jupyter Notebook

With terminal / Anaconda Prompt, move into the directory you want to work in

Useful Terminal Commands:

cd ~ - home directory
cd .. - move up to the parent directory
cd [folder name] - change directory into the specified folder name
ls - dispaly the name of files / subdirectories in the current directory
pwd - show working directory
mkdir [name of new directory] - create a new folder
rmdir [name of directory] - remove a folder
touch [name of file] - create a new file
up arrow key - get previous command
tab - will auto complete whatever you were typing 

then type:

jupyter notebook