每周六，塔尼都去参加一个3小时的免费课程来提高他的游戏技巧。

Every Saturday, Tani goes to a free 3-hour class to improve his game skills.

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此网站中有两大类课程：免费课程和付费课程。

There are two main categories for courses at the site: free courses, and paid courses.

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50节图形设计免费课程将教授你大量的理论知识。

In the article 50 Totally Free lessons in Graphic Design theory the TutsPlus family definitely delivers with a bevy of knowledge building lessons in theory.

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They will be made available free to the public via the internet, so this is a way of allowing the world to benefit from what we all do at Yale.

它们会通过互联网向公众免费开放，这样全世界的人都能从耶鲁的课程中有所收获,我们要做的。

耶鲁公开课 - 1945年后的美国小说课程节选