@daisynepali do you have friends or family in Canada who can write a letter stating that they are inviting you to visit them for dashain, tihar or english holidays etc, then that's all you need on the invitation side,
US Visa ko lagi did you make a relationship document? I made mine from the VDC in the village stating i'm son of so and so so yedi cha bhane fill out the application and upload the relationship document in pdf.

@statuspidit thank you :) I will start my application soon i'm picking up Thanksgiving as reason to visit my friends up in canada