Office 365 core service: SharePoint
As you get used to working with SharePoint you will probably want to explore some of the more advanced functions. There are many ways in which you can customise your website, including changing the theme, colour scheme and page layout.
Just go to the settings icon (shaped like a wheel) at the top right of your screen and you will see options for site settings and changing the look. Take some time to explore what you can do with your website. Remember, you can always delete any changes you are not happy with.
You can really get to know what SharePoint websites can look like by spending some time exploring all the settings options and other tools.