Gain and Earn
Incorrect : He gains 15 thousand taka a month.
Correct : He earns 15 thousand taka a month.
Incorrect : He has earned a lot of knowledge.
Correct : He has gained a lot of knowledge.
Note: You can gain something useful or necessary, whether or not you deserve it. But you earn something which you deserve or money for the work you do. You can say:
Take a rest now. You have earned it!
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