How do you texture items and is there any programs or plugins that I can use to achieve my desired goals

Hello there I was wondering how do I achive seamless textures but I have came across a problem!


as you can see here it is a repeated texture and I dont know how to fix it. I have also heard of programs that you can texture much better with if any people can help me let me know

A great plugin for texturing is this one.

I was asking for pbr textures as they are now supported through roblox