The first step on any programmers journey is, of course, to greet the world. However, before you can start typing away, you will need to install Python3. To do this, follow these steps:
(I will be describing the installation procedure for Mac computers)

1. Click the magnifying glass in the top right corner of your screen and start typing ‘Terminal’, and hit enter when it pops up.

2. Type python --version and it will tell you what version of python you currently have installed.
Usually something like this: Python 2.7.15 But we want python 3!

3. So next we need to download Apple’s Xcode package in order to install homebrew. so type:
xcode-select --install and hit enter.

4. Ok, now we need to install homebrew, one of the best package managers out there. To do this type:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
and hit enter.

5. Almost there! Now just type: brew install python3 then hit enter.

6. Ok, let’s double-check everything was installed properly, so type: python3 --version and hit enter.
You should see: Python 3.7.0 or something very similar.

7. Now lets open a Python 3 shell in the command line, so type: python3 hit enter.
You should see something like this:
Python 3.7.0 (default, Jun 29 2018, 20:13:13)
[Clang 9.1.0 (clang-902.0.39.2)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

8. Good work! Now go ahead and type:
>>> print("hello world")
hello world
>>>

9. Very Wow, You are Such Amaze programmer! So Excite!