I want model a sword like in the image below, please give me some hints about how to model it: I want any complete tutorial I tried this model but I really don't know to use polygonal modeling or curve? I am sorry for this. Only one or tow tips I want man!
I would first start by drawing or getting a top down view of the sword and starting there. It is a great way to understand the shape of the object you want to make.
From there, just stretch out a plane using extrude E and adding loop cuts (Ctrl+R in edit mode) to add cuts where necessary.
I would suggest looking at some basic modelling tutorials if that doesn't make sense or doesn't help.