Question-How do I get more weapons and elemental arrows?

Alright. This game is probably my top five of all time. I just don't get bored of it, ever. I recently made a new game for botw after not playing for a few years and I realized how truly rusty I am. I do not know where to find weapons(good ones and not boko crap) and they keep breaking. I also am doing well on weapons, bows and shields. Its just the weapons im stuck on. And elemental arrows. I haven't found any since the fire arrows on the great plateau. Answers and help would be much appreciated