Hello ,I am new to collecting swords,,I have collected knives and blades ,and old weaponery for a while but dont have that collection anymore....I have only 3 swords in my collection..1 I bought brand new from a sword maker in china,..it is only a cheapy ,but a good cheapy,if that makes sense,,the 2nd is a ww2 generals katana and the 3rd another katana i have been told dates from the late 1800`s ..dateing method was a tang viewing....,,I have no idea about maintianing a sword apart from keeping it clean and oiled ...if anyone has any advice on products or methods I would greatly appreciate