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Reducing weight involves activity + diet changes + lifestyle changes.
If you are gaining weight day by day, you need check your thyroid
level as well. You havent mention if you are M or F, if you are a female, and if you have irregular menses, that could be related to this weight gain. Ex- PCOS
there is weight gain + irrgular or no menses .
If everything is normal, then increasing activity and controlling fat & carbohydrates in diet will help. If you dont want to join a GYM, try exercising at home, or may be try a hobby like badminton/ dancing/ swimming for 40 - 50 min each day.