推荐几个英文的在线学习的平台2021

2021年刚刚开始，为什么我！这些在线学习平台提供的资源，能够帮助人们学习与天文和科学相关的新知识和新主题，并且它是适合所有年龄段和所有人的。本文将讨论一些我们发现不错的在线学习平台。

Online Learning Platforms

It's the new year, 2021! So why not get the new year started on the right foot with some learning! These online learning platforms are resources can help one learn new skills and new topics related to astronomy and science for all everyone across all age groups! In this article, we will be discussing some of our favorite learning platforms that can be found online.

在新冠疫情发生之前，在线学习已经成为一些大学生生活的主要因素之一了，不同的大学和学校为他们提供不同的在线课程。在新冠疫情的影响下，很多机构的一些学习课程将永久性的转移了线上学习平台。而且，越来越多的学习平台变得越来越数字化，从林林总总的众多平台中发现发现最有价值的资源也是非常重要的。

Online learning has already become a major factor in the lives of some university students before COVID-19 with different colleges and universities offering online courses. With the lessons learned by COVID-19, more institutions might be moving to online learning platforms permanently.  Moreover, as more learning platforms become more digital, it is important to find the most valuable sources.

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Crash Course

Cost: Free     学习成本：完全免费

Website: https://thecrashcourse.com and https://www.youtube.com/user/crashcourse 网站地址
Background: CrashCourse is an educational YouTube channel started by John and Hank Green. The have been funded by the likes of Youtube, Subbable, PBS Digital Studios, Complexly, Youtube Learning Fund, and Arizona State University. Through this funding, Crash Course has been able to provide a wide variety of topics such as World History, Chemistry, Astronomy, AI, and more.

网站介绍：CrashCourse是John和Hank Green 在YouTube创办的一个教育频道。他们主要由以下基金资助：如YouTube,Subbable,PBS数字频道, Comlexly,YouTube学习基金和亚利桑那州立大学等。通过这些基金资助，Crash Course 提供非常广泛的的课程内容，主要由像世界地理、化学、天文、人工智能AI等等。

Benefits: Videos topics are 6 to 15 minutes long and allow the watcher to gain an understanding of the subject without going into too much detail about the nitty gritty. As a starting point to the topic and the big ideas, this is a great start and a great way to learn more on the subject, allowing the users to then deep dive on their own at the discretion of further tools and interests.

特色优点：视频主题是6-15分钟，让观看者获得了解这个主题，而不必去关注太多的细节内容。这种方法作为开始进入一个新的领域或者一些新想法起点非常的不错，他允许学习者使用根据自己的兴趣和一些先进工具进行更深入的学习。

Skillshare

Cost: Free Trial, but then paid membership around $15 per month per Business Insider
Website: https://www.skillshare.com
Benefits: The benefits of Skillshare is that it doesn’t have a course like nature, so its more focused on solving real life problems and learning skills. They support creators and help by having learners support real life problems that are interesting to foster learning. Skill share is really great as it helps learn through real life problems that one can enjoy learning about!

Khan Academy

Cost: Free
Website: https://www.khanacademy.org
Benefits: This tool is a great way for students 2-18 years old to learn course material in a reliable fashion. They have great results and are free of cost to use.

Coursera

Cost: Free, but some might do cost money
Website: https://www.coursera.org
Benefit: Provides courses on relevant subjects from the top tier universities and courses focused on professional training. Similar to EdX, but more focused on professional training. 

EDX

Cost: Free, but verified tracks typically range between $50 and $300 USD.
Website: https://www.edx.org
Benefits: Similar to Coursera, as these are top tracks from top tier universities. EdX offers numerous courses in the humanities and the natural sciences.