i can follow the equations but i dont know what the symbols mean
for quantum and astro would be best
Do you mean something like this: https://en.wikipedia.org/wiki/List_of_physical_quantities
or mathematical symbols? Since physics is bigger than our various alphabets, it might well be that different authors use different forms of notation. Usually their usage can be found at the end or the beginning of textbooks. There are several conventions, some depend on the context. You will naturally adopt them when you study physics.
If you look one in one book, they used "V" for potential energy, but in another, they used "U" for potential energy. I often see "W" as work function, while another use φ.
You have a faulty idea that there is an unambiguous, universal agreement for something like this. There isn't!
Separate names with a comma.