Do i at least need to learn html, xhtml and css for dreamweaver to make a professional looking website?

I am new to all those website stuff like html..xhtml,css, I want to make a professional looking page for my website, and i want to make it from dreamweaver, so to do dreamweaver do i atleast need to know html, xhtml and css? if so how long does it take to learn html xhtml and css.

listen to JR

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