Adobe Dreamweaver is a proprietary web development tool developed by Adobe Systems. Dreamweaver was created by Macromedia in 1997, and was maintained by them until Macromedia was acquired by Adobe Systems in 2005.
As Dreamweaver is web development tool. We can say it’s an intelligent text editor. There are no pre-requisite to learn this software. But you must know in which language you want to code? This is just an editor.
We have covered topics of this software like downloading installation of Dreamweaver, Local root folder, command and site menu, help menu, creating hyperlinks, windows menu, document toolbar, insert and format table, insert menu, modify, table format and View menu.
So this is all basics about Dreamweaver, if you still want help then you can go to official guide of Adobe Dreamweaver at https://helpx.adobe.com/dreamweaver/topics.html