How to install Minecraft Shaders

I need a detailed tutorial how to install Minecraft shader because I'm a beginner on the PC and not through there

That should be detailed enough.

I could now write you a long text how it works… But I'll give you the tip to look in yt for the shader that you want to have and a dowload tutorial.

That's easy

Download Shader. (That comes as ZIP or 7z therefore).
Unpack the ZIP file. Windows can do this: Click on the file on the right and select "Extract".
Then you navigate to the Minecraft installation: To do this, press the Windows key and R, then enter% appdata% \. Minecraft. You should be in the Minecraft folder now.
Now you need Optifine: download it and install it. Then let Minecraft run once with Optifine.
The Minecraft folder should now be a folder called "shaderpacks". Put in the folder you just unpacked (NOT the ZIP file!)
Now you have to start MC: Then you go into the graphics settings and activate because the shader.

If you mean the Bedrock edition (which you can only buy on Windows 10 from the Microsoft Store and support Crossplay) you can forget about it. For Java Edition, please follow the answers here to the users here…