I have decided to learn more about HTML. so I'm going through your online classes. I have a question concerning the differences between some similar tags and which one to use.On page http://www.w3schools.com/html/html_formatting.asp The "text formatting" link gives you lots of choices. My question is that when I go through these examples, which ones should you use in relation to others that are similar. Example, bold vs. strong. Italics vs. Emphasize. What are the purposes of Big and Small? How do these tags affect search engine rankings? Do these tags have any affect on creating an accessible sites?These questions go for these others too.<Pre><code> vs <kbd> vs <tt> vs <samp> vs <var> When should you use these in realtion to each other?I understand that lot of the tags were created a long time ago and are obsolete. I just need to know how they are relevant now and which ones should be used.Is there any books or reference that talks about the use of HTML tags and the philosophy of what to use and what to ignore?Thank you in advance.