See the legend at the bottom of the home page. It will show you how to find the sections that have NEW posts since your last reading.
Also, click on the option "View posts since last visit" in the upper right hand corner of the home page to see what you've missed since your last visit. It will provide a list of topics you still need to read.
Get right down to business
Tired of having to scroll all the way down to see what someone else replied? There is a shortcut! Instead of clicking on the topic, click on the little yellow icon with an arrow pointing to it. It will be there if there is something new to read and it will take you right to the new reply!!
(It is nice.)