If you have the RAM, start both so you can keep checking to see how your work looks in both. There are differences. Do not connect to the Internet at this time. You will be working on your local file. These are the instructions or codes.
Some instructions require another set of instructions to end the format.
Let's try it. I did title this the quick and easy way to build a web site , so we won't go into all the various formatting, heading sizes, etc. Many times the author will have comments on the page. Sour c e in Explorer. Try it on this page and see how I did some of the things you see.