Any free tool or tutorial or add on to let uv unwrap be easy after applying solid and subsurface? Because I find it is so difficult . Thanks.

UV unwrapping is one area that just takes practice the more you do it the better you get at it this series of 4 tutorials has a good UV Mapping tutorial

Creating a Combat Knife Game Asset in Blender

this is also a good UV tutorial

UV Exercise & The UV Project modifier for Auto Global UV’s in Blender

Lobo3433

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Thanks.