how does ur mastry work i mean hoe much u get by match

It depends on what your final stats are in a match compared to the average of other people that also play that champ (I believe it’s compared to people in your rank butI’m not too sure)

By stats I mean stuff like KDA, objectives taken, gold gain, damage dealt and all that stuff. But the main part is CS and KDA relative to the length of the match.

There isn’t a set number per match but you do see how much progress you got for the mastery lvls after you finished a match. You can also see how much progress you have until the next lvl in the collection tab when you hover over the champ.