I need little help

I'm new in subjects like JI and ET and all this things concerning at microtonalism, but I'm very interested about that, a few time a go I study (by myself) the pithagoran scale and other things related with music and math. My asking is if someone can explay me wath are meantone and 3-limit, 5-limit, 7-limit all this things, what is a single scale, wath is a schima and comma.
Thak's for your help, a little help is enogh for me again thanks
Rodrigo

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