I can tune completely by ear now, but I want to know what it means when the tab says drop D and stuff like that. What other ways are there of tuning the guitar?

Basically, could someone list the different tune names and say how many steps up or down and if its only one string or all? It would be a big help. Thanks
drop D means that the 6th string (e)(the thickest string), is tuned down to a D.....i believe there is a article on different tunings in the lessons area but i cant be sure. there are so many different tunings that can be used
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