Well my friend!! A custom is the thing that people of a certain region or society are used to doing for example people who live in the western part of Saudi Arabia have some different customs that they do in Ramadan or Eids which are different from the ones which are done in the southern part or any other regions
Traditions are beliefs that have to do with tribes or a certain family and the things that they have inherited from their ancestors like limiting dowries (the money that is paid for the bride by the groom) or getting married from a family that has the same family name ,so the members of those tribes follow those rules without even changing them and when you ask them they say :well this is the tradition of our fathers
I hope that i've answered your question the way it should be and if you have any more questions please contact me soon
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