There are different links you can click on to download for different computers. Once you have downloaded python, you may have to unzip the file, (for macs) to do this, double click on what you downloaded and then it should unzip the file. Downloading python comes with something called IDLE which is a way you can start coding in python without having to download things like pycharm as your code editor.
You can open IDLE by going to Applications → Python → IDLE. That will open a terminal in which you can start writing python code and running it.
To create a project go to File → New File
Now you can start coding in the new window it made!