Udemy provides you massive and varied catalog of self-paced online courses, many of which are free. It enables professionals to share or sell their expertise through courses. Users can learn or teach via one intuitive interface. Complementary certificates of completion.This is really a very good website for people who are always eager to learn some new things.In my opinion this is the best place for them.Although there are some problem which you might face in this website.Many courses are so short they are effectively tutorials. Free courses constantly seek to upsell users to paid offerings. Inadequate assessment. Limited video captioning and language support. Content needs more careful vetting.