At the front of the webpage you will see this link "Latest Release: ChromeDriver x.xx"
You will most likely want to download the latest release available, though I will be using ChromeDriver 2.45.

After being redirected to a website which will have the options of:
"chromedriver_win32.zip", "chromedriver_mac64.zip", and "chromedriver_linux64.zip"

Choose the appropriate file for your operating system and download it. The *.zip file will contain a binary for your operating system.

2. Installing Selenium

Now that you have all the prerequisites out of the way it is time to get started with Selenium.

I will assume that you have Python installed, but if you don't have it installed go ahead and follow this tutorial here (we will be using Python 3.7):
https://steemit.com/programming/@stolentissue/ever-wanted-to-learn-to-program-start-with-python-here-s-how-to-install-it-part-1

Open up a command line and type this command:
pip install selenium

This command uses Python's default package manager (PIP) to install the latest version of Selenium.

It might take a while depending on your computer.

3. Next Steps

We successfully installed both Selenium and ChromeDriver.

Now it is time to start programming.

For now we will go ahead and create a beginning Selenium program.

Open up a code editor of your choice, I will be using Atom
I will be creating a file named "program.py" but feel free to name it whatever you want.
(if you are new to python, we will be putting all of this text below into the 'program.py' file)

Now we have to import selenium and it's core components:
from selenium import webdriver
from selenium.webdriver.common.keys import Keys

Now we have to initialize the webdriver.

First make sure that the ChromeDriver binary is in your project folder, if not you have to use the second line of code

ChromeDriver in project folder

browser = webdriver.Chrome()

ChromeDriver elsewere

browser = webdriver.Chrome(executable_path=r"\path\to\executable\chromedriver")

Now that we have initialized the browser, lets do a test and search google!
browser.get('http://www.google.com')
search = browser.find_element_by_name('q')

This code above navigates to the URL http://www.google.com and selects the search box.
We have selected the search box, but how do we type in text?
If you notice we have a line at the top of the file
from selenium.webdriver.common.keys import Keys

This imports a selenium module called Keys. This module allows the browser to type text or send keys. So lets use it.
browser.send_keys("browser automation!")
and
browser.submit()

All of this code should navigate to google and search with the keywords of 'browser automation!'

Go ahead and try it yourself!

Here is the full code:

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
browser = webdriver.Chrome()

browser.get('http://www.google.com')
search = browser.find_element_by_name("q")

search.send_keys("browser automation!")

search.submit()