In this guide I will be providng you a quick tutorial showing in minecraft how to install shaders just in case you wanna swim in a realistic ocean then I will show you how to install shaders in minecraft so you could have fun in the real life version of minecraft and enjoy its beauty
The first thing you need to do is head over to the optifine website and download the relevant version!
From there once you've got it downloaded, find a shader off any good website, CraftMC also offers a few shaders.
From here you run optifine which will add in a profile to your minecraft launcher, you can now load this profile and drop in your shader pack into the shaders folder.
Please follow the video along! This is the same for all version of minecraft, so if there is a optifine 1.16 its the same process as if you were installing optifine 1.15.2 for shaders.