Help to understand how many calories I should eat...

I keep hearing different opinions about the calories I should eat daily.
I try my best to eat healthy and I dont count my calories stricktly but when i say to my husband "that has too many calories", he gets mad and say calories doesnt matter, you have to be careful with fat, carbs, etc...

MFP suggest I should eat about 1200 cal a day, others suggest 1200 cal is too low. Of course I know nothing about nutrition, food, etc but I'm trying to get informed.

So my question is How many calories should I eat a day?
I'm 5'3, 142 lb, I exercise 6 days a week (JM 30DS). My goal weight is 135lbs

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