@teacup,
Welcome.
Seen nobody answered your post scriptum:
Tags are simple word you can apply to your post making them easier to find.
Just like tagging your spices in the kitchen. Tagging is mostly used in blogs, but found their ways to social networks and forums.
Using these tags you can group similar posts together or calculate what things are popular. If you go to the main page of this forum and scroll all the way down you will see a lot of random words in different sizes; it called a tagcloud. The bigger words are the most used ones, the smaller the less used. Clicking any tag gives you all the threads that have that particular tag.
Trackbacks are somewhat more sophisticated.
Lets say someone posted a blog that raised a lot of questions with you and you decided to ask them on this forum.
By filling in the link of the blog in the trackback field you send that blog a message like "Hey I posted something about your blogpost" which allows them to put you into a list of websites that said something about it.
Example: If you go to the
Google blog and scroll down you'll see a list of "links" as google calls them that posted something regarding that blogpost.
The main idea is that people reading that blog can quickly see who else has posted something about it.
Hope this clears the confusion.