Do you thing or not that html is an essential skill?

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I think html is a necessary skill for people of today . I tried twice in recent past and learnt some of it . But both the time I failed beyod certain level and gave up . But I am in a challenging situation now. People around me know I am regular user of internet . And in my location it's prievileged distiction .Now and then some of them approach me to teach them some of html . So, I have to learn it properly . Additional benefit will be my kowledge while going to show off my SMARTNESS. but how much time will it take to learn it without spending money taking classroom tutorial? I mean I want to learn online from some free site . My affiliate site is http://www.yaswebsites.com/G312045A