This is a basic readme file that will be shown automatically at the bottom of the folder that contains this file.
Note: The redme file should be named as README.md to be able to see the contents in GitHub.
If you examine the contents of the README file, you will see that titles, bold and italic faces, etc. are created using markdowns. In fact, markdown is a very popular method of text control, you can use it in Jupyter and even in Slack with some exceptions.
Good question. Feel free to start a new text file on your desktop and write your first markdown file. However, if you need a little help, you can try https://stackedit.io/ for a cloud-based markdown experience or download writage as an Add-In to your Microsoft Word.
Well, you can either do more research on markdown and its fascinating capabilities, look more into creating GitHub Wiki and documentation, or continue with the presentation.