Minecraft farm which?

Hi

Please tell me all the farms you can build in minecraft in 1.16.4 java.

There are infinitely many farms that you can build in Minecraft in any shape. The best thing to do is go to Youtube and look for a farm that you need. If you can't find one, you can develop your own and you could release it as a video for other players to build. Let off steam a little, I've packed a few Youtube links for you down here.