HTML coding a thing of the past?

I noticed two things today when I tried to put some HTML coding into this blog to show the diigo group on the right.  The first is I have absolutely no idea how HTML coding works, after 20 minutes the best I could do was it hanging at the very bottom of the page.  The second is that with a gadget allowing me to insert HTML code given to me from another site, I will never need to learn.