Pls tell me on-line course related with the Data Flow Diagram and DFD site explain from the basic level?

Answer 1

Read the chapter below. It's a chapter about DFD's by Ed Yourdon, one of the most influential figures in the world of software design and development methodology.

Answer 2

It's unbelievable ,I mean you've done an awesome job!! I liked it a lot , only one suggestion from my side , you could have increased the font size because I think its rather too tiny , i'm not criticising as such, just a suggestion as a friend . Good luck to you! I 'll keep on checking out the site as you modify it further!