If you want to be able to sell your courses on your own website, you will need to embed our registration form on your website. To do this, click on Training then on Courses. Navigate to the course you want to sell, then click on the ... button and then on Sell Settings.
From there, click on the Sell Settings tab. You will see the buttons that you can click to either iframe the course purchase page on your website, or to copy a link to the same page.
The embed code will allow you to have the registration form appear on your website. You will need to paste it into your website code in order for it to work.
The direct link is simply a link that a user will need to click to navigate to the registration form. This is a great option if you aren't too familiar with your website's HTML code, or if you don't want a form to appear on your website.
To customize what fields appear, please see this article.