How do I get a Minecraft shader?
Google and download.
You can download it from the internet.
For the installation you need Optifine, if you have installed Optifine go to Settings → Video settings → Shader → Open Shader folder and then drag the downloaded shader into this folder
You have to download the shader and then in
% appdata% \. Minecraft \ shader
Insert this file
And in the Minecraft Video Settings you can then select that.
You download Optifine, run the .Jar, download a shader and put it in the folder Appdata / Roaming /.Minecraft/shader
Just put these kinds of questions on YouTube.