The easiest way to install shader in minecraft
Install Opfigine, start Opfigine, exit game, download shader, press Windows + R, enter% appdata%, go to .Minecraft, drag the shader into the Shaders folder, start Opfigine again, select shaders in the Shaders tab
You need Optifine first.
Then you install a shader and move it to the shader folder in the Minecraft folder
For questions, just let me know.