[KenWittlief]

with digital logic the higher voltage signal is always called 1 or H, and the low voltag signal is always 0 or L.

The thing that is sometimes confusing is some signals are active low. For example, reset signals are usually active low. That simply means when you pull the signal low, the device is reset.

Active low signal names usually have a line over the name (not easy to do in a text editor) or the letter L or N tagged on the end, like: RESET_L.

There are electrical reasons why you would sometimes want a signal to be active low intsead of the normally active high, but it would take about a page of this thread to really explain it.