There are two ways to modify your website. Each has pros and cons and require using different tools. You should make you decision based on how comfortable you feel with the tools required for each option, but most importantly, how likely you are to use them for other things. It may not be useful to learn a new tool if you're only going to use it once.
The two options are using GitHub's webpage or using Git locally. I discuss them very briefly below to help you make your decision.
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Modify the website online
You can use Github's webpage to modify your website. This is the easiest method and may very well suit your needs. You won't have to install additional software and can modify your website from any computer or device (e.g., tablet) without worrying much about anything else. However, you won't be able to preview the changes to your website before making them public.
If you don't know what Git is or you are not interested in programming, then this may be the best option for you.
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Modify the website on your computer
This option requires installing a few software and learning to use them. You will also need to learn to use a text editor (e.g., spacemacs [my favorite :) ], vim, atom, notepad)
This requires installing the following software:
After you have installed the required software, you need to Clone this repo to your computer. You should now be able to modify add content to your website.
After making changes, preview them on your local computer following this guide. To make your changes public, you have to push them to GitHub using Git.