This article is a quick fix to share your outlook calendar on the SharePoint site. If you have a group calendar, then disregard this article. This process allows users to book reoccurring events and use a single calendar for booking.
Using the Embed Web Part, paste the following script:
<iframe src="[your calendar link]" width="100%" height="600px" frameborder="0"></iframe>
Replace [your calendar link] by first going to your Outlook calendar that you wish to share. Then click on the cog in the top right corner to get to the settings. Select the "Calendar" section, then "Shared Calendars." Scroll to the bottom to find "Publish a calendar." You'll need to select and publish the calendar you want to embed. The link that will be provided in the bottom "HTML" line is what you will need to put in the iFrame script in place of the outlook.office.com link.